M.E.Ch.A. (Spanish: Movimiento Estudiantil Chican@ de Aztlán; "Chican@ Student Movement of Aztlán", the @ being a gender neutral inflection) is an organization that seeks to promote Chicano unity and empowerment through political action. The acronym of the organization's name is the Chicano word mecha, which is the Chicano pronunciation of the English word, match and therefore symbolic of a fire or spark; mecha in Spanish means fuse or wick. The motto of MEChA is 'La Union Hace La Fuerza' (Unity creates strength).

Mecha may refer to a science fiction genre that centers on robots or machines controlled by people. These machines vary greatly in size and shape, but are distinguished from vehicles by their humanoid or biomorphic appearance. Different subgenres exist, with varying connotations of realism. The concept of Super Robot and Real Robot are two such examples found in Japanese anime. The term may also refer to real world piloted humanoid robots / non-humanoid robotic platforms, either currently in existence or still on the drawing board (i.e. at the planning or design stage). Alternatively, in the original Japanese context of the word (see Characteristics), 'mecha' may refer to mobile machinery/vehicles (including aircraft) in general, manned or otherwise.