We found 21 dictionaries that define the word log on:

General (12 matching dictionaries)

1. log on: Longman Dictionary of Contemporary English
2. log-on, log on: Merriam-Webster
3. log on: Vocabulary.com
4. log-on: Wordnik
5. log-on, log on: Wiktionary
6. log on: Dictionary.com
7. log on: Rhymezone
8. log on: FreeDictionary.org
9. log on: Mnemonic Dictionary
10. log-on, log on: TheFreeDictionary.com

Art (1 matching dictionary)

11. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (1 matching dictionary)

12. log on: Legal dictionary

Computing (3 matching dictionaries)

13. log on: CCI Computer
14. Webopedia (No longer online)
15. log-on, log on: Encyclopedia

Medicine (1 matching dictionary)

16. log on: Medical dictionary

Miscellaneous (1 matching dictionary)

17. log on: Idioms

Slang (1 matching dictionary)

18. log On: Urban Dictionary

Tech (1 matching dictionary)

19. SeaTalk Dictionary of English Nautical Language (No longer online)

(Note: See log-on as well.)

Definitions from Wiktionary (log on) ▸ verb:  Synonym of log in. ▸ verb:  (dated) To visit a website (as distinguished from signing into it; construed with to). Similar: log in, login, sign in, sign on, sign into, come online, dial into, synth, sign into law, take the register, more... Types: sign in, log in, enter, more... Adjectives: walk-in, onz, onboard, going, ace, even, abroach, coming, onward, game on, cont ▸ Words similar to log on ▸ Usage examples for log on ▸ Idioms related to log on ▸ Wikipedia articles (New!) ▸ Words that often appear near log on ▸ Rhymes of log on ▸ Invented words related to log on