simple past tense and past participle of complete
"She completed her marathon training after months of early morning runs."
In plain English: Completed means to finish something so that it is done and there is nothing left to do.
"She completed her homework before dinner."
Usage: Use "completed" to describe an action that has fully finished or been brought to its end in the past. It functions as both the simple past tense and the past participle when paired with a helping verb like "have."
successfully completed or brought to an end
"his mission accomplished he took a vacation"
"the completed project"
"the joy of a realized ambition overcame him"
(of a marriage) completed by the first act of sexual intercourse after the ceremony
"After years of living together, they finally felt their marriage was truly completed when they consummated it at home."
Finished.
"She finally completed her marathon after years of training."
In plain English: Completed means something is finished and done with.
"We need to wait until the construction project is completed before we can move in."
Usage: Use completed as an adjective only after the verb to be or other forms of linking verbs, such as saying the task was completed rather than it completed the task. This placement clearly indicates that the action has already finished.
Derived from the Latin completus, the past participle of complere meaning "to fill up" or "fill to completion." It entered English via Old French, retaining its sense of finishing an action entirely.