completeyoudaoicibaDictYouDict[complete 词源字典]
complete: [14] Complete first reached English as an adjective, either via Old French complet or direct from Latin complētus. This was the past participle of complēre ‘fill up, finish’, a compound verb formed from the intensive prefix com- and plēre ‘fill’, a word related to Latin plēnus ‘full’ (whence plenary, plenitude, plenty, etc) and indeed to English full.

The verb complēre itself came into Old French as the now obsolete complir (complete as a verb is a later formation from the adjective), and was prefixed with a- to produce accomplir. From its stem accompliss- English got accomplish [14].
=> accomplish, compliment, comply, expletive, plenary, plenty[complete etymology, complete origin, 英语词源]
complete (adj.)youdaoicibaDictYouDict
late 14c., from Old French complet "full," or directly from Latin completus, past participle of complere "to fill up, complete the number of (a legion, etc.)," transferred to "to fill, to fulfill, to finish (a task)," from com-, intensive prefix (see com-), + plere "to fill" (see pleio-).
complete (v.)youdaoicibaDictYouDict
late 14c.; see complete (adj.). Related: Completed; completing.