Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: 'more' (adjective and adverb)

plus

1 preposition
     
plus1 S1 W2
1HM used to show that one number or amount is added to another [≠ minus]:
Three plus six equals nine. (3 + 6 = 9)
The total cost was $10, 000, plus 14% interest.
2 and also:
There are numerous clubs, plus a casino.
3

plus or minus

used to say that a number may be more or less by a certain amount:
There may be a variation of plus or minus 5% in the prices that are quoted.

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