What does "conclusive" mean?

Conclusive: 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. Conclusive evidence (Law), that of which, from its nature, the law allows no contradiction or explanation. -- Conclusive presumption (Law), an inference which the law makes so peremptorily that it will not allow it to be overthrown by any contrary proof, however strong. See Final.