From Latin 'explicitus,' past participle of 'explicāre' (to unfold, to unroll a scroll, to disentangle, to explain, to set out clearly), composed of 'ex-' (out) + 'plicāre' (to fold, to bend, to plait). Proto-Indo-European *pleḱ- (to plait, to fold, to weave) is the root of 'plicāre' and one of the most generatively productive roots in the Latin lexicon. What is explicit has been unfolded — every fold opened so that all partsare visible and nothing
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The antonym 'implicit' is built from the same root: 'im-' (in) + 'plicāre' (to fold) = 'folded in,' meaning hidden within. Explicit is unfolded; implicit is folded in. The entire family of '-plicate' and '-ply' words — complicate, replicate, apply, multiply, simple — all come from the same Latin root for folding.
Indo-European relatives. The scribal convention of writing 'explicit' at the end of medieval manuscripts — sometimes abbreviated 'expl.' — meant literally 'it is unrolled': the scroll has been completely unwound and the full text stands exposed to the reader. This scribal use survived centuries in manuscript culture and gives the word its precise spatial logic. Key roots: ex- (Latin: "out, out of"), *pleḱ- (Proto-Indo-European: "to plait, to fold").