Etymology
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homeroom (n.)

also home-room, 1913 in the U.S. schools sense, from home (n.) + room (n.).

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Definitions of homeroom

homeroom (n.)
a classroom in which all students in a particular grade (or in a division of a grade) meet at certain times under the supervision of a teacher who takes attendance and does other administrative business;
Synonyms: home room
From wordnet.princeton.edu