o meaning, o definition | English Cobuild dictionary

Collins

O, o  

  ( O's, o's    plural  )
1       n-var   O is the fifteenth letter of the English alphabet.  
2       num   O is used to mean zero, for example when you are telling someone a telephone number, or mentioning a year such as 1908.  
SPOKEN  
3       exclam   O is used in exclamations, especially when you are expressing strong feelings.  
LITERARY, feelings   O how mistaken you are!..., O God, I want to go home.     
    oh  
Translation English - Cobuild Collins Dictionary  
Collins

O.K.  

, okay  
1   
      adj   acceptable, accurate, adequate, all right, approved, convenient, correct, fair, fine, good, in order, middling, not bad     (informal)   passable, permitted, satisfactory, so-so     (informal)   tolerable, up to scratch     (informal)  
2   
      n   agreement, approbation, approval, assent, authorization, consent, endorsement, go-ahead     (informal)   green light, permission, sanction, say-so     (informal)   seal of approval  
3   
      vb   agree to, approve, authorize, consent to, endorse, entitle, give one's consent to, give the go-ahead, give the green light, give the thumbs up     (informal)   pass, rubber-stamp     (informal)   sanction, say yes to  
4   
      interj   agreed, all right, right, roger, very good, very well, yes  
  
Antonyms     
,       adj   displeasing, inaccurate, inadequate, incorrect, not up to scratch     (informal)   poor, unacceptable, unsatisfactory, unsuitable  

English Collins Dictionary - English synonyms & Thesaurus  

o-face n.
face that people are showing during orgasm
SLANG

Additional comments:

Collaborative Dictionary     English Cobuild
n.
suite of the pointed first letters of the name of an organisation. eg B.O.A.C. , B.B.C., N.A.T.O., N.A.S.A..
When the "sigle" can be read like a simple word, it becomes an "acronym" : Nato, Nasa, Faq,...so B.B.C. is just a "sigle"
n.
a Registered Trademark owned by WHAM-O INC, commonly used to refer its famous flying disc

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"