ca·sern also ca·serne (kə-zûrn)
A military barracks or garrison.
[French caserne, from Old French, small room for the night watch, from Old Provençal cazerna, group of four men, from Latin quaterna, four together, from Latin quaternī, by four; see QUATERNION.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.