O

See also: o, ö, ő, and Variations of "o"

O - Translingual

Letter

O (lower case o)

  1. The fifteenth letter of the basic modern Latin alphabet.

Symbol

O

  1. (chemistry) Symbol for oxygen.
  2. (sports) success
    • Coordinate terms: X (fail), - (skip)
  3. (mathematics) big O: a class of functions asymptotically bounded from above by a specific function, up to a constant factor
  4. (linear algebra, group theory) orthogonal group
  5. (linguistics) A wildcard for a rounded vowel or a back vowel
    • synonyms: U
  • Letter styles
  • Uppercase and lowercase versions of O, in normal and italic type
  • Uppercase and lowercase O in Fraktur

O - English

Letter

O (upper case, lower case o, plural Os or O's)

  1. The fifteenth letter of the English alphabet, called o and written in the Latin script.

Noun

O (plural Os or O's)

  1. Something shaped like the letter O.
  2. (uncountable) A blood type that lacks A or B antigens and may only receive transfusions of similar type O blood, but may donate to all (neglecting Rh factor). Synonym: universal donor.

Number

O (upper case, lower case o)

  1. The ordinal number fifteenth, derived from this letter of the English alphabet, called o and written in the Latin script.

Alternative forms

  • o
  • ô (obsolete)

Particle

O

  1. The English vocative particle, used for direct address.
    • O Death! O Death! Won't you spare me over till another year? - part of the refrain from the American folk song "A Conversation with Death".

Usage notes

  • The word O is typically written in upper case in modern usage.
  • O is often used in translations from languages which have the vocative case.
  • Although it is not strictly archaic, the particle is sometimes used archaizingly. It conveys a formal or reverential tone.

Synonyms

Derived terms

Translations

  • Ancient Greek: (ô)
  • Arabic: يَا (ar) (), أَيُّهَا m (ʾayyuhā), أَيَّتُهَا f (ʾayyatuhā)
    • Egyptian Arabic: يا ()
  • Armenian: ով (hy) (ov)
  • Belarusian: о (o)
  • Catalan: oh, o (ca)
  • Chinese:
    • Mandarin:  (zh) (ō),  (zh) (ō),  (zh) (ā),  (zh) ()(literary)
  • Finnish: oi (fi)
  • French: ô (fr)
  • German: o (de)
  • Hebrew: הו (ho)
  • Irish: a (ga)
    • Old Irish: a, á
  • Japanese:  (ja) (yo), ああ (ja) (ā)
  • Korean:  (ko) (yeo), 시여 (siyeo),  (ko) (a)
  • Latin: o (la)
  • Malay: wahai
  • Persian: ای (fa) (ey), الا (fa) (alā)
  • Polish: o (pl)
  • Portuguese: ó (pt)
  • Russian: о (ru) (o)
  • Sanskrit: हे (sa) (he)
  • Sicilian: o (scn), oh
  • Spanish: oh (es), oy (es) m
  • Swedish: o (sv)
  • Tagalog: oh (formally)
  • Tocharian B: yśe
  • Turkish: ey (tr), ya (tr)
  • Ukrainian: о (uk) (o)
  • Urdu: اَے (ai)
  • Vietnamese: hỡi (vi), lạy (vi)

Noun

O (countable and uncountable, plural Os)

  1. (printing) American Library Association abbreviation of octavo, a book size (20-25 cm).
  2. (soccer) Someone associated with Leyton Orient Football Club, as a player, coach, supporter etc.
  3. (cricket) The number of overs bowled.
  4. (slang) Orgasm.
  5. (slang) Opium.

Adjective

O (not comparable)

  1. (historical) Abbreviation of morally offensive. (film classification of the National Legion of Decency)

Alternative forms

Proper noun

O

  1. A surname from Korean.

Proper noun

O

  1. Alternative form of E

Translations

O - Afar

Letter

O

  1. The fifteenth letter in the Afar alphabet.

O - Afrikaans

Pronunciation

  • (letter name): IPA: /ʊə/

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the Afrikaans alphabet, written in the Latin script.

Noun

O (plural O's, diminutive O'tjie)

  1. O

O - Angami

Letter

O

  1. The eleventh letter of the Angami alphabet, written in the Latin script.

O - Azerbaijani

Letter

O upper case (lower case o)

  1. The twenty-first letter of the Azerbaijani alphabet, written in the Latin script.

O - Basque

Pronunciation

  • IPA: /o/, [o̞]

Letter

O (upper case, lower case o)

  1. The sixteenth letter of the Basque alphabet, called o and written in the Latin script.

O - Chinese

Pronunciation

  • Cantonese (Jyutping): ou1

Adjective

O

  1. (Hong Kong Cantonese) Short for OK (“alright”).

Pronunciation

  • Cantonese (Jyutping): ou1

Adjective

O

  1. (Hong Kong Cantonese, slang) in a relationship

Usage notes

A number may be placed after O to indicate the number of relationships a person has had, including the current one.

Derived terms


Pronunciation

  • Cantonese (Jyutping): ou1

Noun

O

  1. (Hong Kong Cantonese, university slang) orientation camp

Synonyms


Pronunciation 1

  • Mandarin
    • (Pinyin): ōu (ou1)
    • (Zhuyin):
  • Cantonese (Jyutping): ou1
  • Min Nan
    • (Hokkien, POJ): ou
    • (Teochew, Peng'im): ou5
  • Wu (Wiktionary): o (T1)

Letter

O

  1. The fifteenth letter of the Latin alphabet.

Pronunciation 2

  • Mandarin
    • (Pinyin): ō (o1)
    • (Zhuyin):

Letter

O

  1. The fifteenth letter used in Pinyin.

Usage notes

  • The pronunciation above are only used while referring to letters in Pinyin. They are not used in other context (such as English).

Derived terms

O - Dutch

Pronunciation

  • (letter name): IPA: /oː/

Letter

O (capital, lowercase o)

  1. The fifteenth letter of the Dutch alphabet.

Proper noun

O

  1. a surname

Adverb

O

  1. Abbreviation of oost; east

O - Esperanto

Pronunciation

  • (letter name): IPA: /o/
  • (phoneme): IPA: /o/

Letter

O (upper case, lower case o)

  1. The nineteenth letter of the Esperanto alphabet, called o and written in the Latin script.

O - Estonian

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the Estonian alphabet, called oo and written in the Latin script.

O - Finnish

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the Finnish alphabet, called oo and written in the Latin script.

O - French

Pronunciation

  • (letter) IPA: /o/

Noun

O

  1. Abbreviation of ouest; west

Letter

O

  1. the fifteenth letter of the French alphabet

O - Galician

Noun

O

  1. oeste, occidente (west)

Synonyms

  • (west): W

O - German

Pronunciation

  • IPA: /ʔoː/

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the German alphabet.

Noun

O

  1. Abbreviation of Ost; east

O - Hungarian

Pronunciation

  • (phoneme): IPA: [ˈo]
  • (letter name): IPA: [ˈo]

Letter

O (upper case, lower case o)

  1. The twenty-fourth letter of the Hungarian alphabet, called o and written in the Latin script.

Declension

Inflection (stem in long/high vowel, back harmony)
Possessive forms of O

O - Ido

Letter

O (lower case o)

  1. The fifteenth letter of the Ido alphabet, written in the Latin script.

O - Indonesian

Pronunciation

  • (letter name): IPA: /o/
  • (phoneme): IPA: /o/, [o], [ɔ]

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the Indonesian alphabet, written in the Latin script.

O - Italian

Pronunciation

  • (phonemic realization) IPA: /o/, /ɔ/
    • Homophones: o, ho

Letter

O f or m (invariable, upper case, lower case o)

  1. The thirteenth letter of the Italian alphabet, called o and written in the Latin script.

Noun

O m

  1. Abbreviation of ovest; west

O - Korean

Alternative forms

Symbol

O

  1. true.

Antonyms

Derived terms

O - Latvian

Pronunciation

  • IPA: [uə̯], IPA: [o], IPA: [oː]

Letter

O (upper case, lower case o)

  1. The twenty-third letter of the Latvian alphabet, called o and written in the Latin script.

Usage notes

In native Latvian words (and in some older borrowings), o represents the sound of IPA [uə̯] (e.g., otrs [uə̯tɾs]). In more recent borrowings, it represents the original sound of the word, i.e. [o] or [oː] (e.g., opera [oːpeɾa]).

O - Limburgish

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the Limburgish alphabet, written in the Latin script.

Pronunciation

  • IPA: /o/

Noun

O n (plural Owwe, diminutive Öögeltje) (Eupen)

  1. (anatomy) eye
  2. (on plants, esp. potatoes, grapevines and fruit trees) germ, bud; eye (potato)
  3. (on dice) dot, pip, spot
  4. (of a cyclonic storm) eye

Pronunciation

  • IPA: /ɔ/
  • Homophone: o

Noun

O f (plural O, masculine Auwe) (Eupen)

  1. old woman

O - Malay

Pronunciation

  • (Name of letter) IPA: [o]
  • (Phoneme) IPA: [o], [ɔ]

Letter

O

  1. The fifteenth letter of the Malay alphabet, written in the Latin script.

O - Nupe

Pronunciation

  • (phoneme): IPA: /o/

Letter

O (upper case, lower case o)

  1. The eighteenth letter of the Nupe alphabet, written in the Latin script.

O - Polish

Pronunciation

  • IPA: /ɔ/

Letter

O (upper case, lower case o)

  1. The twentieth letter of the Polish alphabet, called o and written in the Latin script.

O - Portuguese

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the Portuguese alphabet, written in the Latin script.

O - Romani

Pronunciation

  • IPA: /o/

Letter

O (upper case, lower case o)

  1. (International Standard) The nineteenth letter of the Romani alphabet, written in the Latin script.
  2. (Pan-Vlax) The twentieth letter of the Romani alphabet, written in the Latin script.

O - Romanian

Pronunciation

  • IPA: /o/

Letter

O (upper case, lower case o)

  1. The eighteenth letter of the Romanian alphabet, called o and written in the Latin script.

Usage notes

When followed by the letter a, a diphthong representing the phoneme /o̯a/ is formed, as in foarte /ˈfo̯ar.te/.

O - Saanich

Pronunciation

  • IPA: /ɑ/

Letter

O

  1. The twenty-third letter of the Saanich alphabet, written in the Latin script.

O - Skolt Sami

Pronunciation

  • (phoneme) IPA: /o/

Letter

O (lower case o)

  1. The twenty-fourth letter of the Skolt Sami alphabet, written in the Latin script.

O - Slovene

Letter

O (capital, lowercase o)

  1. The 16th letter of the Slovene alphabet. Preceded by N and followed by P.

O - Somali

Pronunciation

  • (phoneme): IPA: /ɔ/, /ɞ/
  • (letter name): IPA: /ʔɔ/

Letter

O upper case (lower case o)

  1. The twenty-sixth letter of the Somali alphabet, called o and written in the Latin script.

Usage notes

  • The twenty-sixth letter of the Somali alphabet, which follows Arabic abjad order. It is preceded by I and followed by U.

O - Spanish

Letter

O (upper case, lower case o)

  1. the 16th letter of the Spanish alphabet

Noun

O m

  1. Abbreviation of oeste; west

O - Turkish

Letter

O (upper case, lower case o)

  1. The eighteenth letter of the Turkish alphabet, called o and written in the Latin script.

O - Vietnamese

Pronunciation

Letter

O (upper case, lower case o)

  1. The seventeenth letter of the Vietnamese alphabet, called o or ô and written in the Latin script.

O - Welsh

Pronunciation

  • IPA: /oː/

Letter

O (upper case, lower case o)

  1. The nineteenth letter of the Welsh alphabet, called o and written in the Latin script. It is preceded by N and followed by P.

Mutation

  • O cannot be mutated but, being a vowel, does take h-prothesis, for example with the word oren (“orange”):
Welsh mutation
radicalsoftnasalh-prothesis
oren unchanged unchanged horen
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

O - Yoruba

Pronunciation

  • (phoneme): IPA: /o/
  • (letter name): IPA: /ó/

Letter

O (upper case, lower case o)

  1. The sixteenth letter of the Yoruba alphabet, called ó and written in the Latin script.

O - Zulu

Letter

O (upper case, lower case o)

  1. The fifteenth letter of the Zulu alphabet, written in the Latin script.
Meaning and Definition of O
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