aerate means: Mix ingredients using a mesh screen. To break up any lumps or add air to make them lighten. (in Cooking Dictionary)

What else does aerate mean?

Supply with air, or allow air to circulate. (in Merlin Dictionary)

Exposed to oxygen. Also known as oxygenation by breathing. (in Merlin Dictionary)

A gas used to supply (or charge) liquid, particularly carbon dioxide. (in Merlin Dictionary)