The Collaborative International Dictionary of English v.0.48:

Completion \Com*ple"tion\, n. [L. completio a filling, a
   fulfillment.]
   1. The act or process of making complete; the getting through
      to the end; as, the completion of an undertaking, an
      education, a service.
      [1913 Webster]

            The completion of some repairs.       --Prescott.
      [1913 Webster]

   2. State of being complete; fulfillment; accomplishment;
      realization.
      [1913 Webster]

            Predictions receiving their completion in Christ.
                                                  --South.
      [1913 Webster]

WordNet (r) 3.0 (2006):

completion
    n 1: (American football) a successful forward pass in football
         [syn: completion, pass completion]
    2: a concluding action [syn: completion, culmination,
       closing, windup, mop up]