contribution noun

/ˌkɒn.trɪˈbjuː.ʃən/

/ˌkɑːn-/ n [C or U]

Definition

something that you do or give to help produce or achieve something together with other people, or to help make something successful

All contributions (= presents of money), no matter how small, will be much appreciated.

All contributions (= articles to be printed) for the school magazine must be received by August 1st.

This invention made a major contribution to road safety.

She didn't make much of a contribution (= She did not say much) at today's meeting, did she?

(Definition of contribution noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

If a problem preys on your mind, you think about it and worry about it a lot

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