The process of exposing to air (so as to purify)

• Lawn improvement process
• Purpose of a faucet attachment
• Function of a faucet insert
• Treatment with carbon dioxide
• Exposure to air
• Soda-making process

Wiktionary Word definitions in Wiktionary
alt. The process by which air is circulated through or mixed with a substance such as soil or a liquid. n. The process by which air is circulated through or mixed with a substance such as soil or a liquid.

Wikipedia Word definitions in Wikipedia
Aeration (also called aerification ) is the process by which air is circulated through, mixed with or dissolved in a liquid or substance.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
aeration \aer*a"tion\, Aeration \A`["e]r*a"tion\, n. [Cf. F. a['e]ration.] Exposure to the free action of the air; airing; as, a["e]ration of soil, of spawn, etc. (Physiol.) A change produced in the blood by exposure to the air in respiration; oxygenation ...