D defs.my
Entry 1 sense Webster, 1913

Conclusive

/kən-klo͞os'-ĭv/ · Con·clu·sive · IPA /kənˈkluːsɪv/
01 a. Belonging to a close or termination; decisive; convincing; putting an end to debate or question; leading to, or involving, a conclusion or …
  1. 1.
    Belonging to a close or termination; decisive; convincing; putting an end to debate or question; leading to, or involving, a conclusion or decision.
    “Secret reasons . . . equally conclusive for us as they were for them.” Rogers.
Phrases & compounds
Conclusive evidence — that of which, from its nature, the law allows no contradiction or explanation.
Conclusive presumption — an inference which the law makes so peremptorily that it will not allow it to be overthrown by any contrary proof, however strong.