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Definitions of 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 Pho is most closely related to a, e, and u; as in E. bone, AS. bn; E. stone, AS. stn; E. broke, AS. brecan to break; E. bore, AS. beran to bear; E. dove, AS. dfe; E. toft, tuft; tone, tune; number, F. nombre. dictgcide_fs
  2. the fifteenth letter and fourth vowel of our alphabet, its sound intermediate between a and u--with three values in English, the name-sound heard in note, the shorter sound heard in not, and the neutral vowel heard in son: as a numeral, 'nothing,' or 'zero' (formerly O=11, and ([=O])=11,000): (chem.) the symbol of oxygen: anything round or nearly so (pl. O'S, OES, pron. [=o]z). gutenberg.org/ebooks/37683
  3. OH, [=o], interj. an exclamation of wonder, pain, desire, fear, &c. The form oh is the more usual in prose.--O HONE! OCH HONE! an Irish exclamation of lamentation. [A.S. eá.] gutenberg.org/ebooks/37683