o'
Origin of o'
1Other definitions for O (2 of 15)
or o
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)
(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.)
the exclamation “O.”
Origin of O
3Words that may be confused with O
Other definitions for O (4 of 15)
Grammar. object (def. 7).
Old.
Other definitions for O (5 of 15)
the fifteenth in order or in a series.
the Arabic cipher; zero.
(sometimes lowercase) the medieval Roman numeral for 11.: Compare Roman numerals.
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)
a prefix meaning “descendant,” in Irish family names: O'Brien; O'Connor.
Origin of O'
6Other definitions for o- (7 of 15)
an abridgment of ortho-.
Other definitions for o- (8 of 15)
variant of ob- before m:omission.
Other definitions for o- (9 of 15)
variant of oo-: oidium.
Other definitions for -o- (10 of 15)
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.
Origin of -o-
10- Compare -i-.
Other definitions for -o (11 of 15)
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.
Origin of -o
11Other definitions for o. (12 of 15)
pint.
Origin of o.
12Other definitions for o. (13 of 15)
octavo.
off.
old.
only.
order.
Baseball. out; outs.
Other definitions for O. (14 of 15)
(in prescriptions) a pint.
Origin of O.
14Other definitions for O. (15 of 15)
Ocean.
octavo.
October.
Ohio.
Old.
Ontario.
Oregon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
British Dictionary definitions for o (1 of 8)
O
/ (əʊ) /
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)
/ (ə) /
informal, or archaic shortened form of of a cup o' tea
British Dictionary definitions for O (3 of 8)
chem oxygen
a human blood type of the ABO group: See universal donor
Australian slang offence
Origin of O
3British Dictionary definitions for O (4 of 8)
/ (əʊ) /
a variant spelling of oh
an exclamation introducing an invocation, entreaty, wish, etc: O God!; O for the wings of a dove!
British Dictionary definitions for O'- (5 of 8)
(in surnames of Irish Gaelic origin) descendant of: O'Corrigan
Origin of O'-
5British Dictionary definitions for o- (6 of 8)
short for ortho- (def. 4)
British Dictionary definitions for -o- (7 of 8)
used to connect elements in a compound word: chromosome; filmography Compare -i-
Origin of -o-
7British Dictionary definitions for -o (8 of 8)
forming informal and slang variants and abbreviations, esp of nouns: wino; lie doggo; Jacko
Origin of -o
8Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for O
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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