Nearby words

  1. omri,
  2. oms,
  3. omsk,
  4. omuta,
  5. omw,
  6. on a dime,
  7. on a first-name basis,
  8. on a limb,
  9. on a par with,
  10. on a pedestal, put


Origin of on

before 900; Middle English on, an, Old English: on, in, to; cognate with Dutch aan, German an, Old Norse ā, Gothic ana; akin to Greek aná up, upon (see ana-)

Can be confusedon on to onto


[ on ]
/ ɒn /


Biblical name of Heliopolis.


Also ON., O.N. Old Norse.
Ontario, Canada (approved for postal use).



a suffix used in the names of subatomic particles (gluon; meson; neutron), quanta (graviton), and other minimal entities or components (cistron; codon; magneton; photon).

Origin of -on

probably extracted from ion; cf. proton



a suffix used in the naming of inert gaseous elements: neon.

Origin of -on

Greek -on, neuter of -os adj. ending Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for on

Word Origin for on

Old English an, on; related to Old Saxon an, Old High German, Gothic ana


/ (ɒn) /


the ancient Egyptian and biblical name for Heliopolis


abbreviation for

Old Norse
(esp in postal addresses) Ontario


suffix forming nouns

indicating a chemical substanceinterferon; parathion
(in physics) indicating an elementary particle or quantumelectron; photon
(in chemistry) indicating an inert gasneon; radon
(in biochemistry) a molecular unitcodon; operon

Word Origin for -on

from ion

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for on
Online Etymology Dictionary, © 2010 Douglas Harper