acceleration

noun

1. an increase in rate of change

   noun.attribute

   Examples

   Modern science caused an acceleration of cultural change.

   Antonyms deceleration retardation slowing

   Source: WordNet 3.0

2. the act of accelerating; increasing the speed

   noun.act

   Synonyms quickening speedup

   Antonyms deceleration

   Source: WordNet 3.0

3. (physics) a rate of increase of velocity

   noun.time

   Source: WordNet 3.0

4. The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an <i>acceleration</i> of velocity; -- opposed to <i>retardation</i>.

   noun

   Source: webster1913