o'
[ uh, oh ]
/ ə, oʊ /
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preposition
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Origin of o'
From Middle English; by shortening
Other definitions for o' (2 of 15)
O1
or o
[ oh ]
/ oʊ /
noun, plural O's or Os; o's or os or oes.
the fifteenth letter of the English alphabet, a vowel.
any spoken sound represented by the letter O or o, as in box, note, short, or love.
something having the shape of an O.
a written or printed representation of the letter O or o.
a device, as a printer's type, for reproducing the letter O or o.
Other definitions for o' (3 of 15)
O2
[ oh ]
/ oʊ /
interjection
(used before a name in direct address, especially in solemn or poetic language, to lend earnestness to an appeal): Hear, O Israel!
(used as an expression of surprise, pain, annoyance, longing, gladness, etc.)
noun, plural O's.
the exclamation “O.”
Origin of O
2First recorded in 1125–75; Middle English, from Old French, from Latin ō
Other definitions for o' (4 of 15)
Other definitions for o' (5 of 15)
O4
Symbol.
the fifteenth in order or in a series.
the Arabic cipher; zero.
Physiology. a major blood group, usually enabling a person whose blood is of this type to donate blood to persons of group O, A, B, or AB and to receive blood from persons of group O.Compare ABO system.
Chemistry. oxygen.
Logic. particular negative.
Other definitions for o' (6 of 15)
O'
a prefix meaning “descendant,” in Irish family names: O'Brien; O'Connor.
Origin of O'
Representing Irish ó descendant, Old Irish au
Other definitions for o' (7 of 15)
Other definitions for o' (8 of 15)
Other definitions for o' (9 of 15)
Other definitions for o' (10 of 15)
-o-
the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elements of Greek origin and often used in English as a connective irrespective of etymology: Franco-Italian; geography; seriocomic; speedometer.
Compare -i-.
Origin of -o-
Middle English (<Old French ) <Latin <Greek
Other definitions for o' (11 of 15)
-o
a suffix occurring as the final element in informal shortenings of nouns (ammo; combo; condo; limo; promo); -o also forms nouns, usually derogatory, for persons or things exemplifying or associated with that specified by the base noun or adjective (cheapo; pinko; sicko; weirdo; wino).
a suffix occurring in colloquial noun or adjective derivatives, usually grammatically isolated, as in address: cheerio; kiddo; neato; righto.
Other definitions for o' (12 of 15)
o.1
abbreviation
pint.
Origin of o.
1From the Latin word octārius
Other definitions for o' (13 of 15)
o.2
abbreviation
octavo.
off.
old.
only.
order.
Baseball. out; outs.
Other definitions for o' (14 of 15)
O.1
abbreviation
(in prescriptions) a pint.
Origin of O.
1From the Latin word octārius
Other definitions for o' (15 of 15)
O.2
abbreviation
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
How to use o' in a sentence
British Dictionary definitions for o' (1 of 8)
o
O
/ (əʊ) /
noun plural o's, O's or Os
the 15th letter and fourth vowel of the modern English alphabet
any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form
another name for nought
British Dictionary definitions for o' (2 of 8)
British Dictionary definitions for o' (3 of 8)
O1
symbol for
chem oxygen
a human blood type of the ABO groupSee universal donor
abbreviation for
Australian slang offence
Word Origin for O
(for sense 3) from Latin (neg) o I deny
British Dictionary definitions for o' (4 of 8)
O2
/ (əʊ) /
interjection
a variant spelling of oh
an exclamation introducing an invocation, entreaty, wish, etcO God!; O for the wings of a dove!
British Dictionary definitions for o' (5 of 8)
O'-
prefix
(in surnames of Irish Gaelic origin) descendant ofO'Corrigan
Word Origin for O'-
from Irish Gaelic ó, ua descendant
British Dictionary definitions for o' (6 of 8)
British Dictionary definitions for o' (7 of 8)
Word Origin for -o-
from Greek, stem vowel of many nouns and adjectives in combination
British Dictionary definitions for o' (8 of 8)
-o
suffix
forming informal and slang variants and abbreviations, esp of nounswino; lie doggo; Jacko
Word Origin for -o
probably special use of oh
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
Medical definitions for o' (1 of 4)
O 22
abbr.
oculus
Medical definitions for o' (2 of 4)
O 11
The symbol for the elementoxygen
Medical definitions for o' (3 of 4)
o-
abbr.
ortho- (often italic)
Medical definitions for o' (4 of 4)
-o-
Used as a connective to join word elements:acidophilic.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for o'
O
The symbol for oxygen.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.