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Fewer indicates plural number and is used with plural nouns.
Less and lesser indicate a singular amount and are used with singular nouns (which are often uncountable).
Less is also used with plural measurements of distance, money, time, etc., which express overall amounts that are usually considered singular:
Less is also frequently used in mathematics to mean “smaller.”
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TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
Writing tools – Writing Tips
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