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.

Mecha tea is a type of green tea. The name of tea derives from the early leaf buds needed to make this special green tea. Mecha is harvested in spring and made as rolled leaf teas that are graded somewhere between Gyokuro and Sencha in quality. Mecha are made from a collection of leaf buds and tips of the early crops.

Mecha! is a tabletop miniature wargame published by American game publisher Seventh Street Games (now Flagship Games) in 1993. As its name implies, Mecha! is a game featuring gigantic mecha (towering war machines piloted by humans) that allows players to simulate raging battles on land, air, sea and space. The game is currently out of print.