(economics) In a market trade, the side where the supply comes from.

(slang, baseball, dated, 19th c.) three outs.

The female or maternal branch of a family.

Alternative spelling of side effect

To alter as a side effect.

An unintended consequence of any action in addition to the intended consequence of that action.

(sports) A play in American football whereby the team performing the kick-off kicks the ball the minimum distance (ten yards in most levels of play) in an attempt to immediately regain possession of the ball.

(cricket) the visiting side on a tour

An amphipod, Hyalella azteca, indigenous to the Everglades.

The reverse side of a cassette tape or a phonograph record, especially a vinyl single, often containing songs not considered for airplay.