# BASIC ALGEBRA GLOSSARY

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Title Description
Octagon An eight-sided polygon.
Octant As we have four quadrants in the rectangular plane, we have eight Octants in rectangular space.
In three dimensions the three axes divide space into eight sections, each termed an Octant.
Odd In common language: strange or unusual.
For integers, numbers ending with any of these digits: 1, 3, 5, 7, or 9.
Odds The likelihood or probability of an event or specific outcome is termed the Odds of the event occurring.
Odds, or probabilities, are always represented with values between 0 and 1, or between zero and 100 percent (inclusively).
Omega The last, or 24th, letter of the Greek alphabet is Omega.
Upper-case Omega is used for ohms, a unit of electrical resistance.
Lower-case Omega is used for angular velocity, a speed of rotation.
Omicron The 15th letter of the Greek alphabet.
We don't use it in math because it looks just like an "o" or a zero.
One-Dimensional Linear, or along one line of direction.
Informally, constrained to stay along a narrow line.
Open Interval A section of a line whose set does not include the endpoints is considered an Open Interval.
Operation The processes of addition, subtraction, multiplication, and division are each termed an Operation.
So, too, is raising a value to a exponent.
Opposite Many meanings are found for Opposite, including having direction 180 degrees from an original direction, or having the negative sign of a previous sign.
Opposite real values have identical absolute values.
Order (Polynomial) The Order of a Polynomial relates to the highest power of variables in a term, typically the Order of the leading term of the Polynomial.
Order of Operations We have a hierarchy of Order to Operations in the language of mathematics.
We do multiplication before we do addition, and we also work left-to-right.
We work first inside of expressions within parentheses, then outward.
Order, Polynomial The Order of a Polynomial relates to the highest power of variables in a term, typically the Order of the leading term of the Polynomial.
Ordered Pair Two coordinates are required to label a point in a plane, typically (x, y).
Ordered Triple Three coordinates are required to label a point in space, typically (x, y, z).
Ordinal Number Ordinal Numbers are ordinary numbers, or the sequential references of order as first, second, third, and so on.
Ordinate In Cartesian or rectangular coordinates, the y-axis, or the coordinate from the y-axis; the second coordinate in an ordered pair.
Origin In one dimension: (0).
In two dimensions: (0,0).
In three dimensions: (0, 0, 0).
Orthogonal Most generally Orthogonal means perpendicular to a plane.
Outcome A specific event is often termed an Outcome.
Outlier When plotting data points, as in a scatterplot, if a single data point is far removed from the neighborhood of the other data points, such a far-removed data point is called an Outlier.

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