Etymology
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knowledgeable (adj.)

also knowledgable, c. 1600, "capable of being known, recognizable" (a 17c. sense now obsolete), from knowledge in its Middle English verbal sense + -able. The sense of "having knowledge, displaying mental capacity" is from 1829 and probably a new formation.

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Definitions of knowledgeable

knowledgeable (adj.)
highly educated; having extensive information or understanding;
a knowledgeable audience
a knowledgeable critic
Synonyms: knowing / learned / lettered / well-educated / well-read
knowledgeable (adj.)
alert and fully informed;
surprisingly knowledgeable about what was going on
Synonyms: knowing
knowledgeable (adj.)
thoroughly acquainted through study or experience; "this girl, so intimate with nature"-W.H.Hudson; "knowledgeable about the technique of painting"- Herbert Read;
Synonyms: intimate / versed
From wordnet.princeton.edu