Looking for math words that start with O?

From Obelus to Ovoid and a lot in between, there are a lot of words beginning with O that are used in math terminology.

To help you out, I’ve put together a list of the most common math-related words I was able to find:

## Math Words That Start With O

**Obelus **– a symbol consisting of a line with dots above and below (like this: ÷), and it is also known as a division sign

**Object **– an abstract concept arising in mathematics.

**Oblique **– this adjective refers to geometric lines or planes that are not parallel or perpendicular to a line or surface.

**Oblong **– a 2D shape that has two pairs of parallel sides and four right angles.

**Obtuse Angle** – exceeding 90 degrees but less than 180 degrees.

**Octagon **– an eight-sided polygon or 8-gon.

**Octal **– The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7.

**Odd Number** – a number which is not divisible by 2.

**Odds **– defined as the probability that the event will occur divided by the probability that the event will not occur.

**Omega **– omega function refers to a function using the Greek letter omega.

**Open Curve** – Curves with different beginning and end points is called an Open Curve.

**Operation **– a function which takes zero or more input values (called operands) to a well-defined output value.

**Opportunity Cost **– The value attached to the other options and choices you give up by doing something.

**Opposite Numbers **– the positive and negative versions of the same number.

**Order Of Operations **– a collection of rules that reflect conventions about which procedures to perform first in order to evaluate a given mathematical expression.

**Ordered Pair** – a pair of elements a, b having the property that ( a, b) = (u, v ) if and only if a = u, b = v.

**Origin **– the point where the axes of the system intersect.

**Orthogonal **– intersecting or lying at right angles In orthogonal cutting, the cutting edge is perpendicular to the direction of tool travel.

**Oscillating Series** – a series that is divergent but not properly divergent.

**Outcome **– a possible result of an experiment or trial.

**Outlier **– a value that lies outside of the distribution of a pattern.

**Oval **– a curve that looks like an ellipse or an egg.

**Ovoid **– a curve that looks like an ellipse or an egg.

I hope you found the words you were looking for from the list above.

This isn’t an exhaustive list, if there are any math words starting with the letter O that you would like added to the list, please leave me a comment below.

If you’d like to explore more math words starting with different letters of the alphabet, click any of the letters below to go to the list for that letter:

*Image credits – Photo by Joshua Hoehne on Unsplash*