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academic costume

American  

noun

  1. the ceremonial garb of the students and faculty in schools, colleges, and universities, consisting of a flat cap (mortarboard), a long, wide-sleeved gown, and sometimes a hood, worn especially at commencement exercises.

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.