Sir

1. (n.) A man of social authority and dignity; a lord; a master; a gentleman; -- in this sense usually spelled sire.

2. (n.) A title prefixed to the Christian name of a knight or a baronet.

3. (n.) An English rendering of the Latin Dominus, the academic title of a bachelor of arts; -- formerly colloquially, and sometimes contemptuously, applied to the clergy.

4. (n.) 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.

Thesaurus Entries

Herr, Master, Mister, abecedarian, assume, bwana, certified teacher, change, docent, doctor, dominie, draw on, dress in, educationist, educator, fellow, get into, get on, guide, guru, instructor, maestro, master, melamed, mentor, misrepresent, monsieur, mullah, pandit, pedagogist, pedagogue, preceptor, professor, pundit, put on, rabbi, sahib, schoolkeeper, schoolmaster, schoolteacher, signor, sir, slip, slip on, starets, teacher