n. The act of repelling or driving back, or the state of being repelled; specifically, in physics, the action which two bodies exert upon each other when they tend to increase their mutual distance: as, the repulsion between like magnetic poles or similarly electrified bodies.n. The act of repelling mentally; the act of arousing repellent feeling; also, the feeling thus aroused, or the occasion of it; aversion.n. In biology, conspicuous unlikeness in the color or markings of allied species which inhabit the same locality.