Usually means: Positioned at the surface of.
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We found 48 dictionaries that define the word on:

General (28 matching dictionaries)
  1. ON, -on, on: Merriam-Webster.com
  2. ON, ON, -on, on: Oxford Learner's Dictionaries
  3. ON, on: American Heritage Dictionary of the English Language
  4. -on, on: Collins English Dictionary
  5. on: Vocabulary.com
  6. O'N, ON, On, On, o'n, on, on, on, on, on, on, on, on, on, on, oN: Wordnik
  7. on: Cambridge Advanced Learner's Dictionary
  8. ON, -on, on, on-: Wiktionary
  9. -on, on: Webster's New World College Dictionary, 4th Ed.
  10. -on, on: The Wordsmyth English Dictionary-Thesaurus
  11. on: Infoplease Dictionary
  12. ON, -on, o.n, on: Dictionary.com
  13. on: Online Etymology Dictionary
  14. on: Cambridge Essential American English Dictionary
  15. ON (BTS song), ON (music), ON, On (Ancient Egypt), On (BTS and Sia song), On (BTS song), On (Boom Boom Satellites album), On (EP), On (Echobelly album), On (Elisa album), On (Gary Glitter album), On (Japanese prosody), On (band), On (biblical figure), On (novel), On (song), On: Wikipedia, the Free Encyclopedia
  16. On: Online Plain Text English Dictionary
  17. on: Webster's Revised Unabridged, 1913 Edition
  18. on: Rhymezone
  19. on: AllWords.com Multi-Lingual Dictionary
  20. on: Webster's 1828 Dictionary
  21. ON, on: Stammtisch Beau Fleuve Acronyms
  22. on: Free Dictionary
  23. on: The Phrontistery - A Dictionary of Obscure Words
  24. on: Mnemonic Dictionary
  25. ON: Dictionary/thesaurus
  26. on: Wikimedia Commons US English Pronunciations

Art (1 matching dictionary)
  1. Paris Cookbook (No longer online)

Business (3 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. On: Bloomberg Financial Glossary
  3. On (disambiguation), On: Financial dictionary

Computing (1 matching dictionary)
  1. On (disambiguation), on: Encyclopedia

Medicine (3 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Multiple Sclerosis Encyclopaedia (No longer online)
  3. On (disambiguation), -on, o.n, on: Medical dictionary

Miscellaneous (4 matching dictionaries)
  1. Encyclopedia of the Orient (No longer online)
  2. ON: Acronym Finder
  3. AbbreviationZ (No longer online)
  4. on: Idioms

Religion (2 matching dictionaries)
  1. On: Easton Bible
  2. On, On: Smith's Bible Dictionary

Science (1 matching dictionary)
  1. ON: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (3 matching dictionaries)
  1. on, on, on: Green’s Dictionary of Slang
  2. on: English slang and colloquialisms used in the United Kingdom
  3. On [the rocker], on: Urban Dictionary

Tech (2 matching dictionaries)
  1. ON: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. AUTOMOTIVE TERMS (No longer online)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  In the state of being active, functioning or operating.
adjective:  Happening; taking place; being or due to be put into action.
adjective:  (informal) Of a person, used to express agreement to or acceptance of a proposal or challenge made by that person; most commonly with subject "you" (see you're on).
adjective:  Fitted; covering or being worn.
adjective:  (postpositive) Of a stated part of something, oriented towards the viewer or other specified direction.
adjective:  (chiefly UK, informal, usually negative) Acceptable, appropriate.
adjective:  (often negative) Possible; capable of being successfully carried out.
adjective:  (informal) Destined; involved, doomed.
adjective:  (baseball, informal) Having reached a base as a runner and being positioned there, awaiting further action from a subsequent batter.
adjective:  (cricket) Within the half of the field on the same side as the batsman's legs; the left side for a right-handed batsman.
adjective:  (snooker, postpositive) Of a ball, being the next in sequence to be potted, according to the rules of the game.
adjective:  (acting, drama, roleplaying games) Acting in character.
adjective:  (informal, of a person) Performative or funny in a wearying manner.
adjective:  (euphemistic) Menstruating.
adverb:  To an operating state.
adverb:  So as to cover or be fitted.
adverb:  Along, forwards (continuing an action).
adverb:  In continuation, at length.
adverb:  (obsolete in the US) Later.
adverb:  Of betting odds, denoting a better-than-even chance. See also odds-on.
verb:  (Singapore, Philippines, Malaysia, Nigeria, transitive, colloquial) To switch on.
noun:  In the Japanese language, a pronunciation, or reading, of a kanji character that was originally based on the character's pronunciation in Chinese, contrasted with kun.
noun:  (linguistics) Initialism of Old Norse. [The language of Scandinavia until the 14th century, the common ancestor of modern Swedish, Danish, Norwegian, Faroese, and Icelandic.]
noun:  Abbreviation of Ontario, a province of Canada. [A province in eastern Canada. Capital: Toronto.]

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