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1. (In science fiction) An automaton or artificial lifeform (in modern cases, entirely machine-based), often intended to serve humans or other lifeforms, which may or may not possess artificial intelligence. May or may not end up taking over the world and destroying all the humans. 2. A machine which is capable of sometimes complex movement, which may be programmed by computer, operated by remote control or possesses some form of rudimentary AI, used to perform some useful function. 3. (In anime and related media) A large machine of usually humanoid appearance, often operated by a human pilot, usually capable of walking and possibly flying, usually used in combat. (also called mecha, giant robot).
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