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別の表記

• substract (obsolete)

語源

Borrowed from Latin subtractus, perfect passive participle of subtrahō (“to draw from beneath; withdraw, remove”); from sub (“under”) + trahō (“to draw, pull, drag”).

発音

• (General American) IPA: /səbˈtɹækt/
• 韻: -ækt

動詞

subtract (third-person singular simple present subtracts, present participle subtracting, simple past and past participle subtracted)

1. (transitive, arithmetic) To remove or reduce; especially to reduce a quantity or number.

   If you subtract the $100 for gas from the total cost, it was a fairly inexpensive trip.

   • 2022 August 7, Alec Wilkinson, “Could learning algebra in my 60s make me smarter?”, in The Guardian‎, archived from the original on 22 March 2023:

     I could add and subtract and multiply and divide, but I entered the wilderness when words became equations. […] The axioms of arithmetic imply that when you expand (a + b), for example, you get a + 2ab + b in the following way: (a + b) is equal to (a + b)(a + b). Each term in one parentheses multiplies the terms in the other: a × a = a ; a × b = ab; b × a = ab; b × b = b. Combining the terms, a + ab + ab + b = a + 2ab + b. In a similar way, a – b, a squared number subtracted from another squared number, called a difference of squares, becomes (a – b)(a + b), which becomes a + ab – ab – b, which is a – b.

同意語

反意語

• add

派生語

関連する語

• subtraction
• subtractor