Meaning

noun the state of being cancelled or annulled

noun (law) a formal termination (of a relationship or a judicial proceeding etc)

noun the act of abrogating; an official or legal cancellation

originRecorded since the 15th century (sense destruction); from Middle English anullement, partly from annullen (from Middle French annuller, from Latin annūllāre, from ad (“to”) + nūllus (“not any, nothing”) + verbal ending -āre) + -ment (“means to”) (from Latin -mentum) and partly from Middle French annullement. By surface analysis, annul + -ment.

Etymology from Wiktionary, CC BY-SA 3.0