The side of a cassette tape or record that holds the primary track. / (by extension) The track on the A-side of a tape or record. / The first track on a compact disc single.

(Canada, US) A building material which covers and protects the sides of a house or other building.

present participle of side

(rail transport) A second, relatively short length of track just to the side of a railroad track, joined to the main track by switches at one or both ends, used either for loading or unloading freight, storing trains or other rail vehicles; or to allow two trains on a same track to meet (opposite directions) or pass (same direction) (the latter sense is probably an American definition).

simple past tense and past participle of side

(rugby) Called by the referee at the end of a match, as no side has the next possession of the ball.

Forms adjectives describing position next to or alongside an object. / Forms adjectives and adverbs describing position in relation to a dividing line or other separation.

(rare, nonstandard) Of or relating to the side (of something); lateral.

(rare, nonstandard) To the side; sideways; laterally; sideling; obliquely; indirectly.

Separate from the main course of a meal. / Supplementary or in addition to one's usual job or income. / Additional, surreptitious; often with a connotation of dishonesty, illegality or adultery.