Informative
来自Big Physics
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late Middle English (in the sense ‘formative, giving life or shape’): from medieval Latin informativus, from Latin informare ‘give form to, instruct’ (see inform).
wiktionary
inform + -ative
etymonline
informative (adj.)
1650s, "instructive, didactic," from Medieval Latin informativus, from Latin informatus, past participle of informare "to train, instruct, educate" (see inform). In Middle English, the same word meant "formative, shaping, plastic, having power to form or animate" (late 14c.). Related: Informatively.
