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assiduous (adj.)
"attentive, devoted, constant in application," 1530s, from Latin assiduus "attending; continually present, incessant; busy; constant," from assidere/adsidere "to sit down to, sit by" (thus "be constantly occupied" at one's work); from ad "to" (see ad-) + sedere "to sit," from PIE root *sed- (1) "to sit." The word acquired a taint of "servile" in 18c. Related: Assiduously; assiduousness.
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Definitions of assiduous from WordNet
Dictionary entries near assiduous
asseveration
ass-head
ass-hole
assibilate
assiduity
assiduous
assiento
assify
assign
assignat
assignation