Citations:O

vocative particle, not reverential

 * At the beginning of a sentence:
 * 1611, King James Bible, Galatians 3:1:
 * O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?
 * circa 1690, someone quoted in 1764 by Joseph Grove in The Lives of All the Earls and Dukes of Devonshire, page 209:
 * His Lordship was so great an enemy to all arbitrary proceedings, that he expressed his abhorrence of them in the following lines:
 * "O despicable state of all that groan
 * Under a blind dependency on one! "
 * Inside a sentence:
 * 1823, Memoirs of the Court of Queen Elizabeth, page 157:
 * whom sir Thomas Pope took by the bosom, saying, O traitor! how couldst thou find in thy heart to work such a villany as to take wages, and being trusted over a band of men, to fall to her enemies, returning against her in battle?
 * 1946, Otis Adelbert Kline, The man who limped: and other stories, page 64:
 * "So, O consort of a flea-bitten camel," she snarled, "you thought to play a trick on your little Moorish cousin. For this, O mangy dog, shall your head and shoulders part company this day."
 * "I but carried out your wishes, ya sitt," I said.