Are you looking for some math words that start with the letter O? 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 O. 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 O” and discover the beauty and relevance of arithmetic in our lives.

**Math Words That Start With O**

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

**1. Obelus:** The “obelus” is a symbol (÷) used to represent the division operation in arithmetic. It indicates the quotient obtained when one number is divided by another.

**2. Object:** In geometry, an “object” refers to a three-dimensional shape or figure. Objects have length, width, and height and occupy space.

**3. Oblique:** “Oblique” is a term used in geometry to describe lines, angles, or shapes that are slanted or inclined but not horizontal or vertical.

**4. Oblique Cone:** An “oblique cone” is a cone whose axis is not perpendicular to its base. It is inclined or slanted with respect to the base.

**5. Oblique Cylinder:** An “oblique cylinder” is a cylinder whose axis is not perpendicular to its base. It appears slanted or tilted.

**6. Oblique Prism:** An “oblique prism” is a three-dimensional solid with two parallel and congruent polygonal bases that are not perpendicular to the lateral faces.

**7. Oblique Pyramid:** An “oblique pyramid” is a pyramid whose base is not perpendicular to the lateral faces, making it appear slanted.

**8. Oblong:** “Oblong” is a term used to describe a shape that is elongated and rectangular but not necessarily a perfect rectangle.

**9. Obtuse Angle:** An “obtuse angle” is an angle that measures more than 90 degrees but less than 180 degrees.

**10. Obtuse Triangle:** An “obtuse triangle” is a triangle with one obtuse angle (greater than 90 degrees).

**11. Octagon:** An “octagon” is a polygon with eight sides and eight angles.

**12. Octagon Formula:** The “octagon formula” calculates the sum of the interior angles of an octagon, given by (8 – 2) × 180°.

**13. Octagonal Prism:** An “octagonal prism” is a three-dimensional solid with two octagonal bases and eight rectangular lateral faces.

**14. Octahedron:** An “octahedron” is a polyhedron with eight faces, each being an equilateral triangle.

**15. Octal:** “Octal” refers to the base-8 number system, which uses digits from 0 to 7 to represent numbers.

**16. Octal Number System:** The “octal number system” is a numeral system that uses base-8 digits to represent numbers.

**17. Odd Number:** An “odd number” is an integer that cannot be divided evenly by 2.

**18. Odds:** “Odds” in probability represent the likelihood of an event occurring, usually expressed as a ratio.

**19. Odometer:** An “odometer” is an instrument in vehicles used to measure the distance traveled.

**20. One Dimensional:** “One-dimensional” refers to objects or shapes that have only length and no width or height.

**21. Ones:** “Ones” are the digits that represent units or the first position in the place-value system.

**22. Opaque:** In geometry and optics, “opaque” describes an object or material that does not allow light to pass through, making it not transparent.

**23. Open Curve:** An “open curve” is a curve that does not close or form a loop, with distinct endpoints.

**24. Open Interval:** An “open interval” is a range of real numbers that does not include its endpoints.

**25. Open Sentence:** An “open sentence” is a mathematical statement with one or more variables that can be true or false depending on the values assigned to the variables.

**26. Open Shape:** An “open shape” is a two-dimensional figure that is not closed, meaning it does not form a complete loop.

**27. Operation:** An “operation” in mathematics refers to a mathematical process or action, such as addition, subtraction, multiplication, or division.

**28. Operations on Rational Numbers:** “Operations on rational numbers” involve performing mathematical operations on fractions or rational numbers.

**29. Operator:** An “operator” in mathematics is a symbol or function that indicates an operation to be performed on one or more values.

**30. Opportunity Cost:** In economics, “opportunity cost” is the value of the next best alternative foregone when a decision is made.

**31. Opposite Numbers:** “Opposite numbers” are numbers that are the same distance from zero on the number line but have different signs (one positive and one negative).

**32. Opposite Side:** In geometry, the “opposite side” refers to the side of a polygon or angle that is not adjacent to a particular angle or vertex.

**33. Or:** “Or” is a logical operator used in mathematical statements to indicate that either one or both conditions are true.

**34. Order Of Magnitude:** The “order of magnitude” is a measure of the approximate size or scale of a quantity, expressed as a power of 10.

**35. Order of Operations:** The “order of operations” is a set of rules that determines the sequence in which mathematical operations should be performed to obtain a correct result.

**36. Ordered Pair:** An “ordered pair” is a pair of numbers used to locate a point in a two-dimensional coordinate system, represented as (x, y).

**37. Ordering:** “Ordering” refers to arranging a set of numbers or objects in a specific sequence or order.

**38. Ordering Decimals:** “Ordering decimals” involves arranging decimal numbers in increasing or decreasing order.

**39. Ordinal Number:** An “ordinal number” indicates the position or rank of an object or element in a sequence, such as first, second, third, etc.

**40. Ordinary Differential Equation:** An “ordinary differential equation” involves derivatives of a function with respect to a single independent variable.

**41. Ordinate:** The “ordinate” is the y-coordinate of a point in a two-dimensional coordinate system.

**42. Origin:** The “origin” is the point (0, 0) in a two-dimensional coordinate system, where the x-axis and y-axis intersect.

**43. Origin Symmetry:** A figure has “origin symmetry” if it remains unchanged when rotated 180 degrees about the origin.

**44. Orthocenter:** In a triangle, the “orthocenter” is the point where all three altitudes of the triangle intersect.

**45. Orthogonal:** “Orthogonal” refers to the perpendicular or right angle relationship between two lines or vectors.

**46. Oscillating Series:** An “oscillating series” is a series whose terms alternate in sign and may not converge to a specific value.

**47. Ounce:** An “ounce” is a unit of weight or mass, commonly used in measurements of food and liquids.

**48. Outcome:** In probability, an “outcome” is a possible result or occurrence of a random experiment.

**49. Outlier:** An “outlier” is a data point that significantly deviates from the rest of the data set.

**50. Oval:** An “oval” is a shape that resembles a flattened circle, often used informally to describe elongated and rounded shapes.

**51. Ovoid:** An “ovoid” is a three-dimensional shape resembling an egg or an elliptical sphere.

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

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

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 P
- Math Words That Start With Q
- Math Words That Start With R
- Math Words That Start With S