ETYM Latin incrementum: cf. French incrément. Related to Increase.
1. The increase of a variable quantity or fraction from its present value to its next ascending value; the finite quantity, generally variable, by which a variable quantity is increased.
2. Matter added; increase; produce; production; -- opposed to decrement.

A scalar or unit amount by which the value of an object such as a number, a pointer within an array, or a screen position designation is increased. Compare decrement1.

To increase a number by a given amount. For example, if a variable has the value 10 and is incremented successively by 2, it takes the values 12, 14, 16, 18, and so on. Compare decrement2.