Sir

n.	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.	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.	An English rendering of the LAtin Dominus, the academical title of a bachelor of arts; - formerly colloquially, and sometimes contemptuously, applied to the clergy. 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.	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. Sir reverance See under Reverence, n.

Noun	1.	sir - term of address for a man
	2.	Sir - a title used before the name of knight or baronet

1.	(language)	SIR - An early system on the IBM 650. [Listed in CACM 2(5):16, May 1959].
2.	(standard)	SIR - Serial Infrared. An infrared standard from IrDA, part of IrDA Data. SIR supports asynchronous communications at 9600 bps - 115.2 Kbps, at a distance of up to 1 metre.

Sustained Information Rate (SMDS)Britain, GB, Great Britain, male aristocrat, UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland