invalidation invalidate • invalidator · · · Info · Definitions · Synonyms · Characters · · invalidation · · Text Latin · · Script 12 · · Length Definitions · · · (noun) (law) a formal termination (of a relationship or a judicial proceeding etc). Synonyms: annulment. · · Noun Definition 1 Synonyms · · · annulment · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074 v latin small letter v U+0076