1 sth that helps cause/increase sth
ADJ. important, significant | big, enormous, great, huge, major, strong, substantial | minor, modest, small | invaluable, positive, useful, valuable We like to think that we are making a positive contribution to society. | notable, outstanding
VERB + CONTRIBUTION make He made a major contribution to peace in the region.
PREP. ~ to a valuable contribution to science
2 money given to help pay for sth
ADJ. generous, large | small | voluntary We rely entirely on voluntary contributions.
VERB + CONTRIBUTION make, offer, pay
PREP. ~ to/towards I'd like to make a small contribution to the cost of the holiday.