MATH GLOSSARY
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| Title | Description | |
|---|---|---|
| Oblique | In one sense, at an angle or not perfectly horizontal or vertical. An Oblique triangle is any triangle that is not a right triangle. |  |
| Obtuse | In common language Obtuse means obscure and confusing, obfuscatory. An Obtuse angle measures more than 90 degrees (and less than 180 degrees). | |
| 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. | |
| Odd Function | An Odd Function adheres to this property: f(-x) = -f(x). The standard sine function is an odd function. | |
| 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 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, Matrix | The Order of a Matrix is its size, expressed as "rows by columns." | |
| 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. | |
| Ordinary Differential Equation | A Differential Equation with no partial derivatives is considered an Ordinary Differential Equation. | |
| 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). | |
| Orthocenter | The Orthocenter of a triangle is the point of concurrence of the altitudes of the triangle. | |
| 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. | |
| Oval | In common language, any elliptical shape or not-quite round "circular" shape is called an Oval. Mathematically, an ellipse is not an Oval. | |
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Math Glossary
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