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Synonyms

monsieur

American  
[muhs-yur, muh-syœ] / məsˈyɜr, məˈsyœ /

noun

plural

messieurs

  1. the conventional French title of respect and term of address for a man, corresponding to Mr. or sir.

monsieur British  
/ məsˈjɜː, məsjø /

noun

  1. a French title of address equivalent to sir when used alone or Mr when placed before a name

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of monsieur

1490–1500; < French: literally, my lord (originally applied only to men of high station); sire

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Croque monsieur is a French sandwich served hot with gooey, melted cheese.

From BBC • Jun. 27, 2025

When they don't work out, he switches his plan up and makes a pretty straight-ahead croque monsieur with herbaceous Vietnamese touches — cilantro, basil, et cetera.

From Salon • Apr. 20, 2022

The Julia Child Challenge In the season finale, the three finalists prepare four-course meals from Child’s classic recipes: a croque monsieur, duck a l’orange, boeuf bourguignon and a croquembouche.

From Los Angeles Times • Apr. 18, 2022

Milo would be having the croque monsieur, because, as he succinctly put it, “I just like it!”

From Seattle Times • Feb. 12, 2022

“N’est-ce pas, monsieur, qu’il y a un cadeau pour Mademoiselle Eyre dans votre petit coffre?”

From "Jane Eyre" by Charlotte Brontë

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.