We found 23 dictionaries that define the word plus sign:

General (19 matching dictionaries)

1. plus sign: Longman Dictionary of Contemporary English
2. plus sign: Merriam-Webster
3. plus sign: Oxford Learner's Dictionaries
4. plus sign: American Heritage Dictionary of the English Language
5. plus sign: Collins English Dictionary
6. plus sign: Vocabulary.com
7. plus-sign, plus sign: Wordnik
8. plus sign: Cambridge Advanced Learner's Dictionary
9. plus sign: Wiktionary
10. plus sign: The Wordsmyth English Dictionary-Thesaurus
11. plus sign: Infoplease Dictionary
12. Plus sign, plus sign: Dictionary.com
13. Plus sign: Wikipedia, the Free Encyclopedia
14. plus sign: Rhymezone
15. plus sign: FreeDictionary.org
16. plus sign: TheFreeDictionary.com
17. plus sign: Mnemonic Dictionary

Computing (1 matching dictionary)

18. plus sign: Encyclopedia

Miscellaneous (1 matching dictionary)

19. Encyclopedia of Graphic Symbols (No longer online)

Science (2 matching dictionaries)

20. Plus Sign: Eric Weisstein's World of Mathematics
21. plus sign: PlanetMath Encyclopedia

(Note: See plus_signs as well.)

Definitions from Wiktionary (plus sign) ▸ noun:  (arithmetic) The symbol + used to denote the operation of addition, to indicate that a number is positive, and so on. Similar: plus, addition sign, minus-plus sign, sign, minus sign, plus mark, multiplication sign, equal sign, times sign, numero symbol, more... Opposite: minus, negative, subtraction Phrases: plus minus sign, more... Adjectives: plus, o, signed, magic, zero, zeroth, variable, signature, numeral, fixed point, iterate ▸ Words similar to plus sign ▸ Usage examples for plus sign ▸ Idioms related to plus sign ▸ Wikipedia articles (New!) ▸ Words that often appear near plus sign ▸ Rhymes of plus sign ▸ Invented words related to plus sign