Etymology
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maths (n.)

British English colloquial abbreviation of mathematics, by 1911; see math.

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math (n.1)

American English shortening of mathematics, 1890; the British preference, maths, is attested from 1911. "Math. is used as an abbreviation in written English in the U.K. but not in speech, the normal form being Maths" [OED].

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