O.N

Collins
World English Dictionary
on (ɒn)
 
prep
1.  in contact or connection with the surface of; at the upper surface of: an apple on the ground; a mark on the table cloth
2.  attached to: a puppet on a string
3.  carried with: I've no money on me
4.  in the immediate vicinity of; close to or along the side of: a house on the sea; this verges on the ridiculous!
5.  within the time limits of a day or date: he arrived on Thursday
6.  being performed upon or relayed through the medium of: what's on the television?
7.  at the occasion of: on his retirement
8.  used to indicate support, subsistence, contingency, etc: he lives on bread; it depends on what you want
9.  a.  regularly taking (a drug): she's on the pill
 b.  addicted to: he's on heroin
10.  by means of (something considered as a mode of transport) (esp in such phrases as on foot, on wheels, on horseback, etc)
11.  in the process or course of: on a journey; on strike
12.  concerned with or relating to: a tax on potatoes; a programme on archaeology
13.  used to indicate the basis, grounds, or cause, as of a statement or action: I have it on good authority
14.  against: used to indicate opposition: they marched on the city at dawn
15.  used to indicate a meeting or encounter: he crept up on her
16.  (used with an adjective preceded by the) indicating the manner or way in which an action is carried out: on the sly; on the cheap
17.  informal
 a.  staked or wagered as a bet: ten pounds on that horse
 b.  charged to: the drinks are on me
18.  (usually followed by it)
 (Austral) drinking alcoholic liquor
19.  informal, dialect or to the loss or disadvantage of: the old car gave out on us
 
adv
20.  in the position or state required for the commencement or sustained continuation, as of a mechanical operation: the radio's been on all night
21.  attached to, surrounding, or placed in contact with something: the girl had nothing on
22.  taking place: what's on tonight?
23.  in a manner indicating continuity, persistence, concentration, etc: don't keep on about it; the play went on all afternoon
24.  in a direction towards something, esp forwards; so as to make progress: we drove on towards London; march on!
25.  on and off, off and on intermittently; from time to time
26.  on and on without ceasing; continually
 
adj
27.  functioning; operating: turn the switch to the on position
28.  informal (postpositive)
 a.  performing, as on stage: I'm on in five minutes
 b.  definitely taking place: the match is on for Friday; their marriage is still on
 c.  tolerable, practicable, acceptable, etc: your plan just isn't on
 d.  (of a person) willing to do something
29.  informal on at nagging: she was always on at her husband
30.  cricket (of a bowler) bowling
 
n
31.  cricket
 a.  (modifier) relating to or denoting the leg side of a cricket field or pitch: the on side; an on drive
 b.  (in combination) used to designate certain fielding positions on the leg side: long-on; mid-on
 
[Old English an, on; related to Old Saxon an, Old High German, Gothic ana]

On (ɒn)
 
n
the ancient Egyptian and biblical name for Heliopolis

ON
 
abbreviation for
1.  Old Norse
2.  (esp in postal addresses) Ontario

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

on
O.E. on, unstressed variant of an "in, on, into," from P.Gmc. (cf. Du. aan, Ger. an, Goth. ana "on, upon"), from PIE base *ano "on" (cf. Avestan ana "on," Gk. ana "on, upon," L. an-, O.C.S. na, Lith. nuo "down from"). Also used in O.E. in many places where we would now use in. From 16c.-18c. (and still
in northern England dialect) often reduced to o'. Phrase on to "aware" is from 1877.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

-on 1
suff.

  1. A subatomic particle: neutron.

  2. A unit: photon.

  3. A basic hereditary unit: codon.

-on 2
suff.
Inert gas: radon.

-on 3
suff.
A chemical compound that is not a ketone or a compound that contains oxygen in a carbonyl group: parathion.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
ON
  1. Old Norse

  2. Ontario

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Easton
Bible Dictionary

On definition


light; the sun, (Gen. 41:45, 50), the great seat of sun-worship, called also Bethshemesh (Jer. 43:13) and Aven (Ezek. 30:17), stood on the east bank of the Nile, a few miles north of Memphis, and near Cairo, in the north-east. The Vulgate and the LXX. Versions have "Heliopolis" ("city of the sun") instead of On in Genesis and of Aven in Ezekiel. The "city of destruction" Isaiah speaks of (19:18, marg. "of Heres;" Heb. 'Ir-ha-heres, which some MSS. read Ir-ha-heres, i.e., "city of the sun") may be the name given to On, the prophecy being that the time will come when that city which was known as the "city of the sun-god" shall become the "city of destruction" of the sun-god, i.e., when idolatry shall cease, and the worship of the true God be established. In ancient times this city was full of obelisks dedicated to the sun. Of these only one now remains standing. "Cleopatra's Needle" was one of those which stood in this city in front of the Temple of Tum, i.e., "the sun." It is now erected on the Thames Embankment, London. "It was at On that Joseph wooed and won the dark-skinned Asenath, the daughter of the high priest of its great temple." This was a noted university town, and here Moses gained his acquaintance with "all the wisdom of the Egyptians."

Easton's 1897 Bible Dictionary
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