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English word sir comes from Proto-Italic *magjōs, Proto-Indo-European *mag-, Proto-Indo-European *-yos, Latin maior domus, Proto-Indo-European *sénos (Old.)
*magjōs (Proto-Italic)
*mag- (Proto-Indo-European)
great, to knead, press, to knead, mix, make
*-yos (Proto-Indo-European)
comparative suffix
maior domus (Latin)
*sénos (Proto-Indo-European)
Old.
senior (Latin)
Older, elder; rather old.
seignur (Old French)
(Anglo-Norman).
sir (Middle English)
sir (English)
(colloquial) Used as an intensifier after yes or no.. A man of a higher rank or position.. A respectful term of address to a man of higher rank or position, particularly:. A respectful term of address to any male, especially if his name or proper title is unknown.. To a knight or other low member of the peerage.. To a superior military officer.. To a teacher. To address (someone) using "sir".