1. A man of rank; such as, a feudal lord, especially in England (from Latin senior, "older"): In some of the novels by Sir Walter Scott, many of the seigniors owned vast lands and forest areas.

The seignior had asked for an audience with the king to discuss some local economic improvements.

2. Used as a form of address for such a man: When coming to the great hall, the knights saluted the seignior who was the lord and a person of rank and respect.
3. Etymology: from Middle English segnour, from Old French seignor, from Vulgar Latin senior, from Latin, "older"; comparative of senex, sen-, "old".