"completing" in the verb sense
1. complete, finish
come or bring to a finish or an end others finished in over 4 hours"
"He finished the dishes"
"She completed the requirements for her Master's Degree"
"The fastest runner finished the race in just over 2 hours
2. complete
bring to a whole, with all the necessary parts or elements
"A child would complete the family"
3. dispatch, discharge, complete
complete or carry out
"discharge one's duties"
4. complete, nail
complete a pass
5. complete, fill out, fill in, make out
write all the required information onto a form
"fill out this questionnaire, please!"
"make out a form"
"completing" in the adjective sense
1. complemental, complementary, completing
acting as or providing a complement (something that completes the whole)
Source: WordNet® (An amazing lexical database of English)
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