Englishfor English speakers
contribution
Noun
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A contribution is something that you give or add.
Technology to reduce pollution could make a significant contribution to the solution.
Some of his most important early contributions were his detailed descriptions and illustrations.
Their contribution in October has been revised down from £300million to the same level.
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The money you give to someone, especially for a donation, is your contribution.
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The amount of work you did on a project.
His contribution was very low. He did almost nothing.
unit
Noun
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One of a measure of something; the amount of something that is counted as "one".
Measure five units to the left.
$4 is the unit price.
A pound is a useful unit for thinking about amounts of butter.
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Form of measurement.
I prefer metric units.
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Item, used when no other word for something exists.
He set up the A/C unit.