increment

Short definition from Wiktionary

Noun

1. 1
   The action of increasing or becoming greater.
2. 2
   The amount of increase.
3. 3
   An amplification without strict climax, as in the following passage: "Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report, […] think on these things."
4. 4
   The amount of time added to a player's clock after each move.
5. 5
   A syllable in excess of the number of the nominative singular or the second-person singular present indicative.

Verb

1. 1
   To increase by steps or by a step, especially by one.