Having the quality of educating or teaching; serving to educate or improve knowledge.
From educate + -ive (adjective suffix meaning 'tending to' or 'having the quality of'). The -ive suffix comes from Latin -ivus.
An 'educative' experience doesn't need to happen in school—a sunset, a failure, a conversation can all be educative, suggesting that education isn't confined to institutions but happens whenever something teaches us something real.
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