O

O (lower case o)

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

• (Latin script):  Aa  Bb  Cc  Dd  Ee  Ff  Gg  Hh  Ii  Jj  Kk  Ll  Mm  Nn  Oo  Pp  Qq  Rr  Sſs  Tt  Uu  Vv  Ww  Xx  Yy  Zz
• (Variations of letter O):  Óó  Òò  Ŏŏ  Ôô  Ốố  Ồồ  Ỗỗ  Ổổ  Ǒǒ  Öö  Ȫȫ  Őő  Õõ  Ṍṍ  Ṏṏ  Ȭȭ  Ȯȯ  Ȱȱ  Øø  Ǿǿ  Ǫǫ  Ǭǭ  Ōō  Ṓṓ  Ō̂ō̂  Ṑṑ  Ỏỏ  Ȍȍ  Ȏȏ  Ơơ  Ớớ  Ờờ  Ỡỡ  Ởở  Ợợ  Ọọ  Ộộ  Ɵɵ  ⱺ  ᴏ  Ｏｏ  Ꜵꜵ  Œœ  Ꝏꝏ  Ꝍꝍ  Ȣȣ

O

1. (chemistry) Symbol for oxygen.
2. (mathematics) big O: a class of functions asymptotically bounded from above by a specific function, up to a constant factor
3. (linear algebra, group theory) orthogonal group

• Letter styles
• 
  Normal and italic O
• 
  Uppercase and lowercase O in Fraktur

Other representations of O:

• o (for the vocative particle)

• (UK) IPA^(key): /əʊ/

  Audio (RP)

  (file)

• (US) IPA^(key): /oʊ/

  Audio (GA)

  (file)

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.

O (uncountable)

1. 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.

• (Latin-script letters) letter; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

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.

English O, o is attested in William Tyndale's 1525 New Testament Translation, as a translation of Ancient Greek ὦ (ô, interjection), Latin o.

O

1. The English vocative particle, used for direct address.
   • 1525, Tyndale's translation of Romans 2.1,3:

     Therefore arte thou inexcusable o man whosoever thou be that iudgest. For in that same where in thou iudgest another, thou cõdemnest thysilfe. For thou that iudgest doest evẽ the same silfe thynges. […] Thynkest thou O man that iudgest them which do soche thyngs and yet dost evẽ the very same, that thou shalt escape the iudgemẽt of God?

   • (Can we date this quote?), Samuel Taylor Coleridge

     O! the affecting beauty of the death of Cawdor, and the presentimental speech of the king: […]

   • For more examples of usage of this term, see Citations:O.

• The word O is always 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.

• O Canada

• oh
• hey
• yo
• ah

• Anglo-Saxon: ēalā, ǣlā, hēlā.
• la (a particle for introducing a statement or expressing surprise), lo
• oh.

Abbreviation.

O

1. (cricket) The number of overs bowled.
2. (slang) Orgasm. (Often used in the phrase the big O.)
   • 1998 October 17, M6968, “STORY: The Violation of Sunny a wrestling story, by Wonder Mike”, in alt.sex.stories, Usenet‎, retrieved November 22, 2014:

     Sunny felt some cold and wet press against her pussy, it startled her, then it's tongue went deep inside of her, she had been eaten out before, but never this could, who ever was doing it was a real pro, and had to have the longest tongue in the world it was buried at least three inches inside of her and was taking long, hard strokes, it was trying to get even deeper, it was only seconds before she started shaking from her first O.

   • 1999 March 31, JT aka GF, “Re: mary p., hex and going "downtown"”, in alt.psst.hoy, Usenet‎, retrieved November 22, 2014:

     Further on, when she's about to reach her first O, the taste turns from no taste to champagne-like.

   • 2010, Lonnie Hicks, Einstein, Religion, Politics and Literature, page 308:

     She thought you could get pregnant from tonguing when kissing; about her first O and how it scared her; how she looked in the mirror afterwards to see if she had changed; about how scared she was when it came time to deliver the baby.

   • 2011 June 14, wtw, “{wtw} - "4someWithFriends" (1/1)”, in alt.sex.stories, Usenet‎, retrieved November 22, 2014:

     Now my friend was fingering my wife and licking her clit. My wife reached her first O of the night.

O (uncountable)

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.

Korean 오, 伍 or 吳 (o, 伍 or 吳)

• Oh, Oe, Au

O

1. A Korean surname​, the English form of a surname very common in Korea. (오 (O), hanja: 伍, 吳).

O

1. The fifteenth letter in the Afar alphabet.

• (Latin-script letters) A a, B b, T t, S s, E e, C c, K k, X x, I i, D d, Q q, R r, F f, G g, O o, L l, M m, N n, U u, W w, H h, Y y

(transliteration needed) (Stokoe O)

1. The letter O

O upper case (lower case o)

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

• (Latin-script letters) hərf; A a, B b, C c, Ç ç, D d, E e, Ə ə, F f, G g, Ğ ğ, H h, X x, I ı, İ i, J j, K k, Q q, L l, M m, N n, O o, Ö ö, P p, R r, S s, Ş ş, T t, U u, Ü ü, V v, Y y, Z z

• (letter name): IPA^(key): /oː/

• Audio

  (file)

O (capital, lowercase o)

1. The fifteenth letter of the Dutch alphabet.

O

1. Abbreviation of oost; east

• Previous letter: N
• Next letter: P

O (upper case, lower case o)

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

• (Latin-script letters) litero; A a, B b, C c, Ĉ ĉ, D d, E e, F f, G g, Ĝ ĝ, H h, Ĥ ĥ, I i, J j, Ĵ ĵ, K k, L l, M m, N n, O o, P p, R r, S s, Ŝ ŝ, T t, U u, Ŭ ŭ, V v, Z z

O (upper case, lower case o)

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

• (Latin-script letters) kirjain; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s (Š š), T t, U u, V v (W w), X x, Y y, Z z (Ž ž), Å å, Ä ä, Ö ö

• (letter) IPA^(key): /o/

• Audio (Paris)

  (file)

O

1. Abbreviation of ouest; west

O

1. The fifteenth letter of the French alphabet.

O

1. oeste, occidente (west)

• (west): W

• IPA^(key): /ʔoː/

• Audio

  (file)

O (upper case, lower case o)

1. The fifteenth letter of the German alphabet.

O

1. Abbreviation of Ost; east

O (lower case o)

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

• (Latin-script letters) litero; A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

• (name of letter) IPA^(key): /ɔ/
• Homophone: ho
• (phoneme) IPA^(key): /o/, /ɔ/
• Homophones: o, ho

O m or f (invariable, lower case o)

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

• (Latin-script letters) lettera; A a (À à), B b, C c, D d, E e (É é, È è), F f, G g, H h, I i (Í í, Ì ì, Πî, J j, K k), L l, M m, N n, O o (Ó ó, Ò ò), P p, Q q, R r, S s, T t, U u (Ú ú, Ù ù), V v (W w, X x, Y y), Z z
• Italian alphabet on Wikipedia.Wikipedia

• ○ (rare)

From Japanese ○ (maru).

O

1. true.

• X

• OX

Proposed in 1908 as part of the new Latvian spelling by the scientific commission headed by K. Mīlenbahs, which was accepted and began to be taught in schools in 1909. Prior to that, Latvian had been written in German Fraktur, and sporadically in Cyrillic.

• IPA^(key): [uə̯], IPA^(key): [o], IPA^(key): [oː]

O

O (upper case, lower case o)

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

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]).

• Letters of the Latvian alphabet:

  burti: Aa, Āā, Bb, Cc, Čč, Dd, Ee, Ēē, Ff, Gg, Ģģ, Hh, Ii, Īī, Jj, Kk, Ķķ, Ll, Ļļ, Mm, Nn, Ņņ, Oo, Pp, Rr, Ss, Šš, Tt, Uu, Ūū, Vv, Zz, Žž

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

O

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

• (Latin-script letters) A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z

O (upper case, lower case o)

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

• (Latin-script letters) letra; A a (Á á, À à,  â, àã), B b, C c (Ç ç), D d, E e (É é, Ê ê), F f, G g, H h, I i (Í í), J j, K k, L l, M m, N n, O o (Ó ó, Ô ô, Õ õ), P p, Q q, R r, S s, T t, U u (Ú ú), V v, W w, X x, Y y, Z z

• IPA^(key): /o/

O (upper case, lower case o)

1. The eighteenth letter of the Romanian alphabet representing the phoneme /o/. Preceded by N and followed by P.

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

• IPA^(key): /ɑ/

O

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

• (Latin-script letters) A, Á, Ⱥ, B, C, Ć, Ȼ, D, E, H, I, Í, J, K, Ꝁ, Ꝃ, ₭, Ḵ, Ḱ, L, Ƚ, M, N, Ṉ, O, P, Q, S, Ś, T, Ⱦ, Ṯ, Ŧ, U, W, W̲, X, X̲, Y, Z, s, ,

• (phoneme) IPA^(key): /o/

O (lower case o)

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

• (Latin-script letters) bukva; A a,  â, B b, C c, Č č, Ʒ ʒ, Ǯ ǯ, D d, Đ đ, E e, F f, G g, Ǧ ǧ, Ǥ ǥ, H h, I i, J j, K k, Ǩ ǩ, L l, M m, N n, Ŋ ŋ, O o, Õ õ, P p, R r, S s, Š š, T t, U u, V v, Z z, Ž ž, Å å, Ä ä, ʹ

O (capital, lowercase o)

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

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

O upper case (lower case o)

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

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

• (Latin-script letters) ', B b, T t, J j, X x, Kh kh, D d, R r, S s, Sh sh, Dh dh, C c, G g, F f, Q q, K k, L l, M m, N n, W w, H h, Y y, A a, E e, I i, O o, U u

O (upper case, lower case o)

1. The 16th letter of the Spanish alphabet.

O

1. Abbreviation of oeste; west

O (upper case, lower case o)

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

• (Latin-script letters) harf; A a, B b, C c, Ç ç, D d, E e, F f, G g, Ğ ğ, H h, I ı, İ i, J j, K k, L l, M m, N n, O o, Ö ö, P p, R r, S s, Ş ş, T t, U u, Ü ü, V v, Y y, Z z

• (Hà Nội) IPA^(key): [ʔɔ˧˧], [ʔo˧˧]
• (Huế) IPA^(key): [ʔɔ˧˧], [ʔow˧˧]
• (Hồ Chí Minh City) IPA^(key): [ʔɔ˧˧], [ʔow˧˧]
• Phonetic: o, ô

O (upper case, lower case o)

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

• (Quốc ngữ letters) chữ; A a (À à, Ả ả, àã, Á á, Ạ ạ), Ă ă (Ằ ằ, Ẳ ẳ, Ẵ ẵ, Ắ ắ, Ặ ặ),  â (Ầ ầ, Ẩ ẩ, Ẫ ẫ, Ấ ấ, Ậ ậ), B b, C c (Ch ch), D d, Đ đ, E e (È è, Ẻ ẻ, Ẽ ẽ, É é, Ẹ ẹ), Ê ê (Ề ề, Ể ể, Ễ ễ, Ế ế, Ệ ệ), G g (Gh gh, Gi gi), H h, I i (Ì ì, Ỉ ỉ, Ĩ ĩ, Í í, Ị ị), K k (Kh kh), L l, M m, N n (Ng ng, Ngh ngh, Nh nh), O o (Ò ò, Ỏ ỏ, Õ õ, Ó ó, Ọ ọ), Ô ô (Ồ ồ, Ổ ổ, Ỗ ỗ, Ố ố, Ộ ộ), Ơ ơ (Ờ ờ, Ở ở, Ỡ ỡ, Ớ ớ, Ợ ợ), P p (Ph ph), Q q (Qu qu), R r, S s, T t (Th th, Tr tr), U u (Ù ù, Ủ ủ, Ũ ũ, Ú ú, Ụ ụ), Ư ư (Ừ ừ, Ử ử, Ữ ữ, Ứ ứ, Ự ự), V v, X x, Y y (Ỳ ỳ, Ỷ ỷ, Ỹ ỹ, Ý ý, Ỵ ỵ)

O (upper case, lower case o)

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

• (Latin-script letters) A a, B b, C c, D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p, Q q, R r, S s, T t, U u, V v, W w, X x, Y y, Z z