probative

the word 'probative' has a clear lineage from latin, built upon the verb probāre, which means to test, prove, or approve. this latin root itself is derived from the adjective probus, meaning good, upright, or honest, implying a process of establishing worth or truth. the suffix -ātīvus was added to form an adjective, creating a term that literally means "having the nature of testing or proving." entering english via old french in the late middle ages, 'probative' has retained this core legal and logical sense, specifically describing evidence that serves to prove or disprove a fact in question.

Structure: prob (test, prove) + ative (adjective suffix) prob (from latin probāre, meaning to test, prove, approve); ative (from latin -ātīvus, a suffix forming adjectives meaning "tending to" or "having the nature of").