We found 14 dictionaries that define the word on the button:

General (11 matching dictionaries)

1. on the button: Longman Dictionary of Contemporary English
2. on the button: Merriam-Webster
3. on the button: Oxford Learner's Dictionaries
4. on the button: Collins English Dictionary
5. on the button: Vocabulary.com
6. on the button: Wiktionary
7. on the button: Dictionary.com
8. on the button: Rhymezone
9. on the button: FreeDictionary.org
10. on the button: Mnemonic Dictionary
11. on the button: TheFreeDictionary.com

Miscellaneous (1 matching dictionary)

12. on the button: Idioms

Slang (1 matching dictionary)

13. On the button: Urban Dictionary

Sports (1 matching dictionary)

14. Texas Hold'em Dictionary (No longer online)

Definitions from WordNet (on the button) ▸ adjective:  being precisely to a prescribed or specified criterion ("The prediction for snow was right on the button") ▸ adverb:  just as it should be Opposite: off-target, inaccurate, imprecise, incorrect, wrong ▸ Words similar to on the button ▸ Usage examples for on the button ▸ Idioms related to on the button ▸ Wikipedia articles (New!) ▸ Popular nouns described by on the button ▸ Words that often appear near on the button ▸ Rhymes of on the button ▸ Invented words related to on the button