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1. WordNet® 3.0 (2006)
O
    n 1: a nonmetallic bivalent element that is normally a colorless
         odorless tasteless nonflammable diatomic gas; constitutes
         21 percent of the atmosphere by volume; the most abundant
         element in the earth's crust [syn: oxygen, O, atomic
         number 8]
    2: the 15th letter of the Roman alphabet [syn: O, o]
    3: the blood group whose red cells carry neither the A nor B
       antigens; "people with type O blood are universal donors"
       [syn: O, type O, group O]

2. The Collaborative International Dictionary of English v.0.48
O \O\ ([=o]), a. [See One.]
   One. [Obs.] --Chaucer. "Alle thre but o God." --Piers
   Plowman.
   [1913 Webster]

3. The Collaborative International Dictionary of English v.0.48
O \O\ ([=o]), interj.
   An exclamation used in calling or directly addressing a
   person or personified object; also, as an emotional or
   impassioned exclamation expressing pain, grief, surprise,
   desire, fear, etc.
   [1913 Webster]

         For ever, O Lord, thy word is settled in heaven. --Ps.
                                                  cxix. 89.
   [1913 Webster]

         O how love I thy law ! it is my meditation all the day.
                                                  --Ps. cxix.
                                                  97.
   [1913 Webster]

   Note: O is frequently followed by an ellipsis and that, an in
         expressing a wish: "O [I wish] that Ishmael might live
         before thee!" --Gen. xvii. 18; or in expressions of
         surprise, indignation, or regret: "O [it is sad] that
         such eyes should e'er meet other object!" --Sheridan
         Knowles.
         [1913 Webster]

   Note: A distinction between the use of O and oh is insisted
         upon by some, namely, that O should be used only in
         direct address to a person or personified object, and
         should never be followed by the exclamation point,
         while Oh (or oh) should be used in exclamations where
         no direct appeal or address to an object is made, and
         may be followed by the exclamation point or not,
         according to the nature or construction of the
         sentence. Some insist that oh should be used only as an
         interjection expressing strong feeling. The form O,
         however, is, it seems, the one most commonly employed
         for both uses by modern writers and correctors for the
         press. "O, I am slain!" --Shak. "O what a fair and
         ministering angel!" "O sweet angel !" --Longfellow.
         [1913 Webster]

               O for a kindling touch from that pure flame!
                                                  --Wordsworth.
         [1913 Webster]

               But she is in her grave, -- and oh
               The difference to me!              --Wordsworth.
         [1913 Webster]

               Oh for a lodge in some vast wilderness! --Cowper.
         [1913 Webster]

               We should distinguish between the sign of the
               vocative and the emotional interjection, writing
               O for the former, and oh for the latter. --Earle.
         [1913 Webster]

   O dear, & O dear me! [corrupted fr. F. O Dieu! or It. O
      Dio! O God! O Dio mio! O my God! --Wyman.], exclamations
      expressive of various emotions, but usually promoted by
      surprise, consternation, grief, pain, etc.
      [1913 Webster]

4. The Collaborative International Dictionary of English v.0.48
O \O\ ([=o]), n.; pl. O's or Oes ([=o]z).
   1. The letter O, or its sound. "Mouthing out his hollow oes
      and aes." --Tennyson.
      [1913 Webster]

   2. Something shaped like the letter O; a circle or oval.
      "This wooden O [Globe Theater]". --Shak.
      [1913 Webster]

   3. A cipher; zero. [R.]
      [1913 Webster]

            Thou art an O without a figure.       --Shak.
      [1913 Webster]

5. The Collaborative International Dictionary of English v.0.48
O \O\ ([=o]).
   1. O, the fifteenth letter of the English alphabet, derives
      its form, value, and name from the Greek O, through the
      Latin. The letter came into the Greek from the
      Ph[oe]nician, which possibly derived it ultimately from
      the Egyptian. Etymologically, the letter o is most closely
      related to a, e, and u; as in E. bone, AS. b[=a]n; E.
      stone, AS. st[=a]n; E. broke, AS. brecan to break; E.
      bore, AS. beran to bear; E. dove, AS. d[=u]fe; E. toft,
      tuft; tone, tune; number, F. nombre.
      [1913 Webster] The letter o has several vowel sounds, the
      principal of which are its long sound, as in bone, its
      short sound, as in nod, and the sounds heard in the words
      orb, son, do (feod), and wolf (book). In connection with
      the other vowels it forms several digraphs and diphthongs.
      See Guide to Pronunciation, [sect][sect] 107-129.
      [1913 Webster]

   2. Among the ancients, O was a mark of triple time, from the
      notion that the ternary, or number 3, is the most perfect
      of numbers, and properly expressed by a circle, the most
      perfect figure.
      [1913 Webster] O was also anciently used to represent 11:
      with a dash over it ([=O]), 11,000.
      [1913 Webster]

6. The Collaborative International Dictionary of English v.0.48
O' \O'\ [Ir. o a descendant.]
   A prefix to Irish family names, which signifies grandson or
   descendant of, and is a character of dignity; as, O'Neil,
   O'Carrol.
   [1913 Webster]

7. The Collaborative International Dictionary of English v.0.48
O' \O'\ ([=o]; unaccented [-o]), prep.
   A shortened form of of or on. "At the turning o' the tide."
   --Shak.
   [1913 Webster]

8. The Free On-line Dictionary of Computing (30 December 2018)
O

    ASCII code 79, The letter of the alphabet, not
   to be confused with 0 (zero) the digit.

   (1999-02-07)


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