
1) Actor Hopkins for one 2) Address at boot camp 3) Address at Camelot 4) Address for a knight 5) Address for a man 6) Address for a superior 7) Address for an officer 8) Address for ben kingsley 9) Address for Galahad 10) Address for Hitchcock 11) Address for isaac newton 12) Address for John 13) Address for many officers 
Found on 
https://www.crosswordclues.com/clue/sir

1) An 2) Mister 3) Sahib 4) Title 
Found on 
https://www.crosswordclues.com/clue/sir

- term of address for a man
 - (British) a title used before the name of knight or baronet
 
Found on 

 Sir is an honorific address used as a courtesy title to address a man without using his given name or family name in many English speaking cultures. It is often used in formal correspondence (Dear Sir, Right Reverend Sir). The term is often reserved for use only towards one of superior rank or status, such as an educator, or as a form of address f...
Found on 
http://en.wikipedia.org/wiki/Sir
[A Series of Unfortunate Events]  ...
Found on 
http://en.wikipedia.org/wiki/Sir_(A_Series_of_Unfortunate_Events)
[people]  The Sir (Old Turkic: - Sir) were a Turkic tribe mentioned in the Orkhon inscriptions in the 8th century. They are thought by some scholars to be related to Sarmatian Siraces. ...
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http://en.wikipedia.org/wiki/Sir_(people)

• (n.) A title prefixed to the Christian name of a knight or a baronet. • (n.) An English rendering of the LAtin Dominus, the academical title of a bachelor of arts; -- formerly colloquially, and sometimes contemptuously, applied to the clergy. • (n.) A respectful title, used in addressing a man, without being prefixed to his name; -...
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http://thinkexist.com/dictionary/meaning/sir/

Society of Interventional Radiology
Found on 
http://www.encyclo.co.uk/local/20895

Sirmium near Mitrovica, serbia (Vojvodina)
Found on 
http://www.encyclo.co.uk/local/21548

Serial Infrared [Hewlett-Packard]
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http://www.encyclo.co.uk/visitor-contributions.php

signal to interference ratio. Variant of signal to noise ratio - commonly used in mobile communications since it implies interference from other transmitters.  
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http://www.encyclo.co.uk/visitor-contributions.php

signal-to-interference radio
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http://www.encyclo.co.uk/visitor-contributions.php
Sir  noun [ Middle English 
 sire , French 
 sire , contr. from the nominative Latin 
 senior an elder, elderly person, compar. of 
 senex ,
 senis , an aged person; akin to Greek ......... old, Sanskrit 
 sana , Goth. 
 sineigs old, 
 sinista eldest, Ir. & Gae...
Found on 
http://www.encyclo.co.uk/webster/S/109

savings-to-investment ratio ( energy conservation investments)
Found on 
http://www.translationdirectory.com/glossaries/glossary136.htm

[
n] - (British) a title used before the name of knight or baronet 2. [n] - term of address for a man
Found on 
http://www.webdictionary.co.uk/definition.php?query=sir

sir A form of sire, a respectful form of address for a king or lord; from Latin senior 'older' through Old French and the source of English senior.
Found on 
http://www.wordinfo.info/words/index/info/view_unit/1934/2

Supplemental Inflatable Restraint
Found on 
http://www3.sympatico.ca/dhaughey/j1930.htm

acronym: Scientific Information and Retrieval (system)
Found on 
https://www.encyclo.co.uk/local/20002

acronym: Shuttle Imaging Radar
Found on 
https://www.encyclo.co.uk/local/20002

acronym: Spaceborne Imaging Radar
Found on 
https://www.encyclo.co.uk/local/20002
 noun term of address for a man
Found on 
https://www.encyclo.co.uk/local/20974

Sir is a name for boys. The name Sir is most commonly given to American boys.
Found on 
https://www.pregnology.com/names/boys/Sir
  No exact match found.