ARITHMETIC GLOSSARY

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Title Description
Octagon An eight-sided polygon.
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Odd In common language: strange or unusual.
For integers, numbers ending with any of these digits: 1, 3, 5, 7, or 9.
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Odds The probability or likelihood of a specified event occurring.
When expressed as a probability, odds are between 0 and 1 or between 0 and 100 percent.
When expressed as a ratio, odds can be any rational number.
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One-Dimensional Linear, or along one line of direction.
Informally, constrained to stay along a narrow line.
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Operation The processes of addition, subtraction, multiplication, and division are each termed an Operation.
So, too, is raising a value to a exponent.
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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.
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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.
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Ordered Pair Two coordinates are required to label a point in a plane, typically (x, y).
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Ordered Triple Three coordinates are required to label a point in space, typically (x, y, z).
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Ordinal Number Ordinal Numbers are ordinary numbers, or the sequential references of order as first, second, third, and so on.
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Ordinate In Cartesian or rectangular coordinates, the y-axis, or the coordinate from the y-axis; the second coordinate in an ordered pair.
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Origin In one dimension: (0).
In two dimensions: (0,0).
In three dimensions: (0, 0, 0).
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Outcome A result, consequence, or conclusion from an event, process or operation. Play_video
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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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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