Meaning

noun the trait of resoluteness as evidenced by firmness of character or purpose

noun the quality of being final or definitely settled

originEtymology tree English decisive Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English decisiveness From decisive + -ness.

Etymology from Wiktionary, CC BY-SA 3.0