con‧trib‧ute /kənˈtrɪbjuːt/ ●●○ S3 W2 AWL verb
    
1 [intransitive, transitive] to give money, help, ideas etc
to something that a lot of other people are also involved in

contribute to/towards

 City employees cannot contribute to political campaigns.

contribute something to/towards something

 The volunteers contribute their own time to the project.

2 [intransitive] to help to make something happen → contributory
Stress is a contributing factor in many illnesses.
Alcohol contributes to 100,000 deaths a year in the US.
His work contributed substantially to our knowledge of the disease and how to treat it.
3 [intransitive, transitive] to write articles, stories, poems etc for a newspaper or magazine → contributor
contribute to
one of several authors contributing to the book