Meaning

noun (baseball) base consisting of a rubber slab where the batter stands; it must be touched by a base runner in order to score

noun a sheet of metal or wood or glass or plastic

noun a full-page illustration (usually on slick paper)

originFrom Middle English plate, from Old French plate, from Medieval Latin plata, from Vulgar Latin *plat(t)us, from Ancient Greek πλατύς (platús, “broad, flat, wide”). Compare Spanish plato. (foot): Cockney rhyming slang, from "plates of meat" for "feet".

Etymology from Wiktionary, CC BY-SA 3.0