Definition of "Contribution" :

noun: the effort contributed by a person in bringing about a result

"I am proud of my contribution in advancing the project."

noun: act of giving in common with others for a common purpose especially to a charity

noun: a writing for publication especially one of a collection of writings as an article or story

noun: an amount of money contributed

"He expected his contribution to be repaid with interest."

noun: a voluntary gift (as of money or service or ideas) made to some worthwhile cause