Partial or biased in favour of one faction or demographic group. / With one competitor dominant over the other. / Out of proportion or lopsided. / Having only one side, like a Möbius strip.

(sports, billiards, snooker, pool) A sidespin of the cue ball which makes it bounce off the cush, or off another ball, at a shallower angle than normal.

Having many sides; polygonal / Having many aspects

Alternative spelling of sidefoot

Having two sides, bilateral. / Reversible. / (algebra) Whose salient properties apply when (the specified object) appears on either side of a given binary operator.

The uppermost side of anything

(video games) A video game where the player views the world from the side, controlling a character who mostly travels horizontally (usually left to right) through a level.

plural of side scroller

(music) A record, released as a single, with an album track on each side, rather than having a B-side.

Alternative spelling of sidelobe