sir sir /ˈsɝː/

noun

1. () Term of address for a man  ( sir )
   term of address for a man
     The polite gentleman addressed his peers as "Sir" out of respect.
   The polite gentleman addressed his peers as "Sir" out of respect.
   

 Sir

1. A title used before the name of knight or baronet  ( Sir )
   a title used before the name of knight or baronet