Usage Note
Sieur is a formal or archaic title equivalent to 'mister', now mainly found in legal documents, historical texts, or used ironically. It is the contracted older form of seigneur. In modern speech it can carry a sardonic tone: le sieur Dupont (that fellow Dupont).
Examples
"Le sieur Martin est convoqué."
Natural Translation
Mister Martin is summoned.

Free starter pack
Building your French vocabulary?
Get the 100 most common French words as a free PDF — one email, no spam.
Related Words
Explore French by topic