early 14c., avisement "examination, inspection, observation," from Old French avisement "consideration, reflection; counsel, advice," from aviser "deliberate, reflect, consider," from avis "opinion" (see advice). Meaning "advice, counsel" is from c. 1400, as is that of "consultation, conference," now obsolete except in legalese phrase under advisement. The unetymological -d- is a 16c. scribal overcorrection.
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