Are you looking for some math words that start with the letter A? Look no further, you have come to the right place.

In this article, I’m going to embark on a journey into the realm of math words that start with the letter A. From algebraic equations to awe-inspiring angles, these words hold the key to unlocking the beauty and complexity of the numerical world.

So, without any further ado, let’s dive into the captivating world of “Math Words That Start With A” and discover the beauty and relevance of arithmetic in our lives.

**Math Words That Start With A**

The followings are the math words that begin with the letter A (In alphabetical order):

**1. Abacus:** The abacus is an ancient counting tool consisting of rows of beads or stones that are used to perform arithmetic operations. It helps in understanding place value and performing addition, subtraction, multiplication, and division.

**2. About:** In mathematical terms, “about” refers to an approximation, which means an estimate or a close value that is not exact but serves a useful purpose in various calculations.

**3. Abscissa:** In coordinate geometry, the abscissa represents the x-coordinate of a point on the Cartesian plane. It helps determine the horizontal position of the point.

**4. Absolute Difference:** The absolute difference between two numbers is the positive value of their subtraction, regardless of the order of the numbers. It provides a way to measure the separation or gap between quantities.

**5. Absolute Error:** Absolute error measures the magnitude of the difference between an estimated value and the actual (true) value. It is the absolute value of the difference between these two quantities.

**6. Absolute Value:** The absolute value of a number is its distance from zero on the number line, always yielding a non-negative value. It is denoted by vertical bars |x|.

**7. Acceleration:** In physics and calculus, acceleration is the rate of change of velocity with respect to time. It describes how fast an object’s speed is changing.

**8. Account:** Though “account” is not a specific math term, in finance and accounting, it refers to a record of financial transactions or a summary of financial information.

**9. Accuracy:** Accuracy indicates the degree of closeness between a measured or estimated value and the actual (true) value. It measures how correct or precise a measurement or calculation is.

**10. Acre:** A unit of area commonly used to measure land, especially in real estate. One acre is equal to 43,560 square feet.

**11. Acute Angle:** An acute angle is an angle that measures less than 90 degrees. It is sharp and compact, falling between 0 and 90 degrees.

**12. Acute Triangle:** A triangle with all three angles measuring less than 90 degrees is called an acute triangle.

**13. Add:** “Add” is a simple and fundamental arithmetic operation that combines two or more numbers to find their total or sum.

**14. Addend:** The numbers involved in an addition operation are called addends. For example, in 5 + 3 = 8, 5 and 3 are the addends.

**15. Adding and Subtracting Decimals:** Addition and subtraction involving decimal numbers, which require careful attention to decimal places.

**16. Adding Fractions:** The process of adding two or more fractions, involving finding a common denominator if necessary and adding the numerators.

**17. Adding Integers:** The addition of positive and negative whole numbers, where the sign indicates the direction (positive/negative) on the number line.

**18. Adding Mixed Numbers:** The addition of whole numbers and fractions together, commonly expressed as mixed numbers.

**19. Addition:** The mathematical operation of combining quantities to find the total or sum.

**20. Addition and Subtraction of Fraction:** The combined process of adding and subtracting fractions.

**21. Addition Facts:** Basic addition equations that students memorize to facilitate mental arithmetic.

**22. Addition Property of Equality:** In algebra, the property that allows you to add the same value to both sides of an equation without changing its validity.

**23. Addition Property of Zero:** The property that states adding zero to any number does not change the value of that number.

**24. Addition Sentence:** A mathematical statement that uses the plus sign (+) to indicate addition.

**25. Addition Table:** A table displaying the results of addition for different numbers, providing a quick reference for elementary addition.

**26. Additive Comparison:** A method of comparison using addition, assessing the difference between two quantities.

**27. Additive Identity:** The number zero (0), which, when added to any number, leaves that number unchanged.

**28. Additive Inverse:** The opposite of a number, which, when added to the original number, results in zero. For example, the additive inverse of 5 is -5.

**29. Adjacent:** Two angles or sides are said to be adjacent if they share a common vertex and side.

**30. Adjacent Angle:** Two angles that share a common vertex and side and do not overlap.

**31. Adjacent Faces:** Faces of a three-dimensional shape that share a common edge.

**32. Adjacent Sides:** Sides of a polygon that share a common vertex.

**33. Algebra:** A branch of mathematics that deals with symbols and letters, representing numbers and quantities in equations and formulas.

**34. Algebraic Expression:** A mathematical expression containing variables, numbers, and arithmetic operations, but no equal sign.

**35. Algebraic Identities:** Equations that hold true for all values of the variables involved, often used in simplification and solving equations.

**36. Algorithm:** A step-by-step procedure or set of rules used for calculations or problem-solving.

**37. Alternate Angles:** Pairs of angles on opposite sides of a transversal intersecting two parallel lines, with equal measures.

**38. Alternate Exterior Angles:** Pairs of angles on opposite sides of a transversal and outside the parallel lines, having equal measures.

**39. Alternate Interior Angles:** Pairs of angles on opposite sides of a transversal and inside the parallel lines, having equal measures.

**40. Alternating Series:** An infinite series where the signs of consecutive terms alternate, resulting in convergence.

**41. Altitude:** The perpendicular distance from the base of a geometric figure, such as a triangle, to the opposite vertex or side.

**42. AM:** Short for “Arithmetic Mean,” the average of a set of numbers, calculated by dividing the sum of the numbers by the count of numbers.

**43. Amplitude:** In trigonometry and waves, the amplitude represents the maximum value reached by a function or waveform.

**44. Analog:** A type of data representation or signal that uses continuous values, such as analog clocks with hour and minute hands.

**45. Analog Clock:** A clock that displays time using hour and minute hands on a circular face, representing continuous time.

**46. Analogy:** A comparison between two different things to highlight their similarities, often used in problem-solving and learning.

**47. And:** A logical operator used to connect two statements or conditions, requiring both to be true for the compound statement to be true.

**48. Angle:** The geometric figure formed by two rays or lines with a common endpoint, known as the vertex.

**49. Angle Bisector:** A line or ray that divides an angle into two equal parts.

**50. Angle Measure:** The size or magnitude of an angle, usually expressed in degrees.

**51. Angle of Depression:** The angle formed between a horizontal line and the line of sight downward to an object at a lower level.

**52. Angle of Elevation:** The angle formed between a horizontal line and the line of sight upward to an object at a higher level.

**53. Angles of a Parallelogram:** The opposite angles in a parallelogram, which have equal measures.

**54. Annual:** Relating to a period of one year or an event that occurs yearly.

**55. Annual Percentage Rate (APR):** The annual interest rate charged on a loan or credit card, representing the cost of borrowing over one year.

**56. Annual Percentage Yield (APY):** The effective annual rate of return on an investment, taking into account compound interest.

**57. Annulus:** The region between two concentric circles, forming a ring-like shape.

**58. Anticlockwise:** In a circular motion, moving counterclockwise or against the direction of a clock’s hands.

**59. Antiprism:** A polyhedron with two congruent and parallel faces (bases) and triangular faces connecting the bases.

**60. Apex:** The topmost point of a cone or pyramid, where the vertices of its lateral faces converge.

**61. Apothem:** The distance from the center of a regular polygon to the midpoint of one of its sides, used to calculate the polygon’s area.

**62. Approximation:** A close estimate or guess that may not be exact but is sufficient for practical purposes.

**63. Arc:** A segment of a curve, usually a portion of a circle’s circumference.

**64. Arc Length:** The distance along a curve between two points on the curve, measured along the arc.

**65. Arccos:** The inverse trigonometric function of cosine, denoted as cos^(-1).

**66. Arcsec:** The inverse trigonometric function of secant, denoted as sec^(-1).

**67. Arcsin:** The inverse trigonometric function of sine, denoted as sin^(-1).

**68. Arctan:** The inverse trigonometric function of tangent, denoted as tan^(-1).

**69. Area:** The measure of the amount of space enclosed by a two-dimensional shape or surface.

**70. Area Model:** A visual representation of multiplication or division problems using rectangular areas or grids.

**71. Area of 2D Shapes:** The measure of the surface enclosed by two-dimensional shapes, such as triangles, rectangles, and circles.

**72. Area of a Pentagon:** The measure of the space enclosed by a pentagon, calculated using specific formulas.

**73. Area of a Quadrilateral:** The measure of the space enclosed by a four-sided polygon.

**74. Area of a Quarter Circle:** The measure of the space enclosed by one-fourth of a circle’s circumference.

**75. Area of a Square:** The measure of the space enclosed by a square, calculated by multiplying its side length by itself.

**76. Area of Shape:** The measure of the space enclosed by any two-dimensional figure or shape.

**77. Argand Diagram:** A complex number representation using the Cartesian coordinate system, with the real part on the x-axis and the imaginary part on the y-axis.

**78. Argument:** In complex numbers, the argument is the angle between the complex number and the positive real axis.

**79. Arithmetic:** The branch of mathematics that deals with basic operations such as addition, subtraction, multiplication, and division.

**80. Arithmetic Mean:** The average of a set of numbers, calculated by dividing the sum of the numbers by the count of numbers.

**81. Arithmetic Progression:** A sequence of numbers where the difference between consecutive terms remains constant.

**82. Arithmetic Sequence:** A sequence of numbers where each term is the sum of the previous term and a fixed constant.

**83. Arm of an Angle:** Each of the two rays forming an angle is referred to as the arm of the angle.

**84. Array:** A rectangular arrangement of objects or numbers in rows and columns, often used for multiplication and division concepts.

**85. Ascending Order:** Arranging numbers or data in increasing order, from the smallest to the largest.

**86. Asset:** In finance, an asset refers to any resource or item with monetary value owned by an individual, organization, or country.

**87. Associative Law:** In algebra, the law that states the grouping of numbers or terms in addition or multiplication does not affect the result.

**88. Associative Property:** The property that states the way in which numbers are grouped in addition or multiplication does not affect the outcome.

**89. Asymmetry:** The absence of symmetry in a shape or object, where one side is different from the other.

**90. Asymptote:** A straight line that a curve approaches but never meets, indicating a boundary or limit of the curve.

**91. Attribute:** A characteristic or property used to describe or classify objects or data.

**92. Autumn:** One of the four seasons, characterized by the transition from summer to winter, often associated with falling leaves.

**93. Average:** The result of adding a set of numbers and dividing the sum by the count of numbers, also known as the arithmetic mean.

**94. Axes:** Plural of “axis,” representing the two perpendicular lines that define a coordinate system.

**95. Axiom:** A self-evident and universally accepted mathematical statement that serves as a starting point for further reasoning.

**96. Axis:** In a coordinate system, the x-axis and y-axis represent the horizontal and vertical dimensions, respectively.

**97. Axis of Symmetry:** In a parabola, the line that divides the parabola into two congruent halves.

**98. Azimuth:** In trigonometry and astronomy, the angle between the horizontal plane and the direction of an object, measured clockwise from the north.

I hope you found this article “Math Words That Start With A” helpful and informative.

Also, keep in mind that, this isn’t an exhaustive list, if there are any math words starting with the letter A.

Feel free to leave a comment below with the missing math word and I’ll update the list as soon as possible.

And, if you’d like to explore more math words starting with different letters of the alphabet, click the link below:

- Math Words That Start With B
- Math Words That Start With C
- Math Words That Start With D
- Math Words That Start With E