|The length of time it takes half of an amount of radioactive material to decay.|
|In a set of n numbers. n divided by the sum of the reciprocals of the number.|
|The set of all points in it plane such that the absolute value of the difference of the distances (focal radii) from two given points (foci) is constant.|
|The longest side of a right triangle. It is opposite the right angle.|
Note: The terms in this collection may not
be entirely accurate.
They are for reference only.