DECI'SIVE, adjective 1. Having the power or quality of determining a question, doubt, or any subject of deliberation; final; conclusive; putting an end to controversy; as, the opinion of the court is decisive of the question. 2. Having the power of determining a contest or event; as, the victory of the allies was decisive
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI