Learner's definition of CONTRIBUTE
to give (something, such as money, goods, or time) to help a person, group, cause, or organization
— usually + to or toward
He contributed [=donated] 100 dollars to the charity.
The volunteers contributed their time towards cleaning up the city.
She contributed [=added] little to the discussion.
We're trying to raise money for a new school, and we're hoping that everyone will contribute.
He did not contribute to the project.
to help to cause something to happen
— usually + to
to write (something, such as a story, poem, or essay) for a magazine
The coach's positive attitude was a contributing factor to/in the team's success. [=the coach's positive attitude was a reason for the team's success]
She has been a contributing writer/editor for the magazine for 10 years.