| Noun | 1. | aeration - the process of exposing to air (so as to purify); "the aeration of the soil"natural action, natural process, action, activity - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity" |
| 2. | aeration - the act of charging a liquid with a gas making it effervescentchange of state - the act of changing something into something different in essential characteristics |