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The Collaborative International Dictionary
aeration

aeration \aer*a"tion\, Aeration \A`["e]r*a"tion\, n. [Cf. F. a['e]ration.]

  1. Exposure to the free action of the air; airing; as, a["e]ration of soil, of spawn, etc.

  2. (Physiol.) A change produced in the blood by exposure to the air in respiration; oxygenation of the blood in respiration; arterialization.

  3. The act or preparation of charging a liquid with carbon dioxide gas to make it effervescent.

  4. the act of charging a liquid with air or oxygen for the purpose of purification.

aeration

Arterialization \Ar*te`ri*al*i*za"tion\, n. (Physiol.) The process of converting venous blood into arterial blood during its passage through the lungs, oxygen being absorbed and carbonic acid evolved; -- called also a["e]ration and hematosis.

Douglas Harper's Etymology Dictionary
aeration

1570s, from French aération, from aérer (v.), from Latin aer (see air (n.1)). In some cases, from aerate.

Wiktionary
aeration

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.

WordNet
aeration
  1. n. the process of exposing to air (so as to purify)

  2. the act of charging a liquid with a gas making it effervescent

Wikipedia
Aeration

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

Usage examples of "aeration".

After aeration, the green slurry then sprayed over suspended trays of vegetation.

The aeration was fairly good, because there was a sort of tunnel running out.