What does aerate mean?
The definition of aerate
Aӑr*ate, v. t.
[imp. & p. p. A; p. pr. & vb. n. A.] Etym: [Cf. F. aérer. See Air,v. t.]

1 To combine or charge with gas; usually with carbonic acid gas, formerly called fixed air. His sparkling sallies bubbled up as from aërated natural fountains. Carlyle.
2 To supply or impregnate with common air; as, to aërate soil; to aërate water.
3 (Physiol.)
To expose to the chemical action of air; to oxygenate (the blood) by respiration; to arterialize. Aërated bread, bread raised by charging dough with carbonic acid gas, instead of generating the gas in the dough by fermentation.