from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Mathematics The symbol (+), as in 2 + 2 = 4, that is used to indicate addition or a positive quantity.
- noun Chemistry The same symbol, used to indicate dextrorotatory rotation of polarized light.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun arithmetic The symbol + used to denote the
operationof additionand to indicate that a number is positive.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a sign indicating the operation of addition
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