1. (noun)omega, Z the ending of a series or sequence "the Alpha and the Omega, the first and the last, the beginning and the end"--Revelation
2. (noun)Z, z, zee, zed, ezed, izzard the 26th letter of the Romanalphabet "the British call Z zed and the Scots call it ezed but Americans call it zee"; "he doesn't know A from izzard"