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.

plural of side.

Third-person singular simple present indicative form of side

(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).

plural of siding

(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.