sir Pronunciation: /sɜːr; sɜː(r)/Translate sir | into French | into German | into Italian Spanish translation of sirn 1 a (as form of address — to male customer) señor, caballero; (— to male teacher) (BrE) profesor, señor b [Corresp] Dear Sir = De mi mayor consideración:, Muy señor mío: 2Sir (as title) sir (m)sir in other Oxford dictionaries Definition of sir in the British & World English dictionary Definition of sir in the US English dictionary