Z (Noun) — The 26th letter of the Roman alphabet. ex. "the British call Z zed and the Scots call it ezed but Americans call it zee"
Z (Noun) — The ending of a series or sequence. ex. "the Alpha and the Z, the first and the last, the beginning and the end"
Z (Noun) — (physics) a short-lived neutral elementary particle that mediates the weak force.