Etymology
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completion (n.)

"act of bringing to a desired end, consummation, full development," late 14c., complecioun, from Medieval Latin completionem (nominative completio), noun of action from past participle stem of Latin complere "to fill up, complete," from com-, here probably as an intensive prefix (see com-), + plere "to fill" (from PIE root *pele- (1) "to fill").

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Definitions of completion

completion (n.)
(American football) a successful forward pass in football;
Synonyms: pass completion
completion (n.)
a concluding action;
Synonyms: culmination / closing / windup / mop up
From wordnet.princeton.edu