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plus sign

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noun Arithmetic.
  1. the symbol (+) indicating summation or a positive quality.
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Origin of plus sign

First recorded in 1645–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for plus sign

plus sign

noun
  1. the symbol +, indicating addition or positive quantity
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012