Function of a faucet insert

• Soda-making process
• Purpose of a faucet attachment
• Treatment with carbon dioxide
• Carbon dioxide treatment
• The act of charging a liquid with a gas making it effervescent
• Exposure to air
• Lawn improvement process

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 ...

WordNet Word definitions in WordNet
n. the process of exposing to air (so as to purify) the act of charging a liquid with a gas making it effervescent