What is the meaning of the word "completing"?

Definitions:

To bring something to an end or to finish it. adjective
- After several hours of hard work, Dave finally completed his report, feeling proud and relieved that he had met the deadline and accomplished his goal.
- Completing the puzzle was no easy feat, but after countless hours spent searching for missing pieces, John felt a surge of excitement and satisfaction as he placed the final piece into place.
- With determination and focus, Sarah was able to complete her marathon training program, crossing the finish line with a sense of accomplishment and joy.