add

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Concise Oxford English Dictionary © 2008 Oxford University Press:
add/ad/
verb
  • 1 join to or put with something else.
  • 2 put together (two or more numbers or amounts) to calculate their total value.

    ■ (add up) increase in amount, number, or degree.

    ■ (add up to) amount to.

  • 3 (add up) informal make sense.
  • 4 say as a further remark.
– origin ME: from L. addit-, addere, from ad- ‘to’ + the base of dare ‘put’.
'add' also found in these Oxford entries:

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