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a respectful or formal term of address used to a man:
No, sir.
(initial capital letter) the distinctive title of a knight or baronet:
Sir Walter Scott.
(initial capital letter) a title of respect for some notable personage of ancient times:
Sir Pandarus of Troy.
a lord or gentleman:
noble sirs and ladies.
an ironic or humorous title of respect:
sir critic.
Archaic. a title of respect used before a noun to designate profession, rank, etc.:
sir priest; sir clerk.
a formal or polite term of address for a man
(archaic) a gentleman of high social status
a title of honour placed before the name of a knight or baronet: Sir Walter Raleigh
(archaic) a title placed before the name of a figure from ancient history

1. An early system on the IBM 650.
[Listed in CACM 2(5):16, May 1959].
2. 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.
shuttle imaging radar


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