'Complete' is Latin for 'filled up' — from PIE *pleh-, the same root behind English 'full' and 'fill.'
Having all the necessary or appropriate parts; entire; to make whole or finish.
From Old French 'complet,' from Latin 'complētus,' past participle of 'complēre' meaning 'to fill up, to finish, to complete,' composed of 'com-' (together, intensive prefix) and 'plēre' (to fill). The PIE root is *pleh₁- meaning 'to fill, to be full,' a root of extraordinary productivity in Indo-European languages. From this root descended Latin 'plēnus' (full), Greek 'plḗrēs' (full), and the Germanic family including
English 'complete' and 'full' are ultimate cognates from PIE *pleh₁- (to fill). Latin kept the 'pl-' onset (plēre, complēre); Germanic shifted it to 'f-' (full, fill). When you say something is 'completely full,' you are etymologically saying it is 'filled-up-ly filled' — a hidden tautology spanning two language
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