Mech

mech, mecha, n. ("mekk," "mekkuh") 1. in anime and manga, powered robotic battle-armor and/or vehicles, usu. piloted by or cybernetically linked to a human operator; examples range from Macross to Ghost in the Shell. 2. in anime, superhero, or cyberpunk games, powered robotic battle-armor and/or vehicles, usu. piloted by or cybernetically linked to a human operator; examples include FASA's Battletech, Activision's Mechwarrior 2 & Mechwarrior 3, Palladium's Robotech RPG, Dream Pod 9's Heavy Gear, and R. Talsorian's Mekton Zeta. [GJ1]
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Addendum: Occasionally seen as Mek, usually among Mekton Zeta players. [NST]