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Oct-
Prefix denoting
eight.
Octagon
A polygon with
eight sides.
Odd
integer
An integer which
is not divisible by 2.
One
The smallest
natural number.
Operation
Any procedure,
such as addition, multiplication etc., that generates a unique value.
Opposite
expressions
Two expressions
whose sum is zero. For example, 2 and -2; x and -x; 3x-2 and -3x+2
are opposite expressions.
Origin
The point of
intersection of all the axes of coordinate system.
Orthogonal
Perpendicular
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