SIR

sir. Sir, n. a word or respect used to men, title, man

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Sir (?), n. [[OE. sire, F. sire, contr. from the nominative L. senior an elder, elderly person, compar. of senex,senis, an aged person; akin to Gr. ��� old, Skr. sana, Goth. sineigs old, sinista eldest, Ir. & Gael. sean old, W. hen. Cf. Seignior, Senate, Seneschal, Senior, Senor, Signor, Sire, Sirrah.]] 1. 1. A man of social authority and dignity; a lord; a master; a gentleman; — in this sense usually spelled sire.
He was crowned lord and sire. Gower. In the election of a sir so rare. Shak. 2. 2. A title prefixed to the Christian name of a knight or a baronet.
Sir Horace Vere, his brother, was the principal in the active part. Bacon. 3. 3. An English rendering of the LAtin Dominus, the academical title of a bachelor of arts; — formerly colloquially, and sometimes contemptuously, applied to the clergy. Nares.
Instead of a faithful and painful teacher, they hire a Sir John, which hath better skill in playing at tables, or in keeping of a garden, than in God's word. Latimer. 4. 4. A respectful title, used in addressing a man, without being prefixed to his name; — used especially in speaking to elders or superiors; sometimes, also, used in the way of emphatic formality. “What's that to you, sir?” Sheridan.
☞ Anciently, this title, was often used when a person was addressed as a man holding a certain office, or following a certain business. “Sir man of law.” “Sir parish priest.” Chaucer. Sir reverance. See under Reverence, n.