/ ɪnˈfɔːmətɪv; NAmE -ˈfɔːrm-/ adjective
giving useful information :
The talk was both informative and entertaining.
OPP uninformative
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WORD ORIGIN
late Middle English (in the sense formative, giving life or shape ): from medieval Latin informativus , from Latin informare give form to, instruct, from in- into + forma a form.