Etymology
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closed (adj.)

"made shut, not open," c. 1200, past-participle adjective from close (v.). Closed circuit "complete, unbroken (electrical) circuit" is attested from 1827; closed shop"workplace in which only union members are employed" is from 1904; closed system first recorded 1896 in William James as "complete and unalterable system (of doctrines, etc.)." Later used in a physical sense, "system in which the total mass or energy remains constant."

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Definitions of closed

closed (adj.)
blocked against entry;
a closed porch
Synonyms: closed in
closed (adj.)
requiring union membership;
a closed shop
closed (adj.)
not open or affording passage or access;
the many closed streets made travel difficult
our neighbors peeped from behind closed curtains
closed (adj.)
(set theory) of an interval that contains both its endpoints;
closed (adj.)
used especially of mouth or eyes;
he sat quietly with closed eyes
Synonyms: shut
closed (adj.)
with shutters closed;
closed (adj.)
not open to the general public;
a closed meeting
closed (adj.)
not having an open mind;
a closed mind unreceptive to new ideas
Synonyms: unsympathetic
closed (adj.)
not open;
Synonyms: shut / unopen
From wordnet.princeton.edu