noun
definition
A benefactor; someone who donates to charity or some cause.
example
I am a longstanding financial contributor to Amnesty International.
definition
A person who backs, supports or champions a cause, activity or institution.
example
He was a regular contributor to Greenpeace protests.
definition
A person (or thing) instrumental in the creation or growth of something.
example
With her strength and intelligence, she was an important contributor to the victorious effort.
definition
A person who produces articles published in a newspaper, magazine, online publication, etc.
example
William Safire has been a notable contributor to the op-ed pages of the New York Times for many years.