remain (v.)

early 15c., from Anglo-French remayn-, Old French remain-, stressed stem of remanoir "to stay, dwell, remain; be left; hold out," from Latin remanere "to remain, to stay behind; be left behind; endure, abide, last" (source also of Old Spanish remaner, Italian rimanere), from re- "back" (see re-) + manere "to stay, remain" (from PIE root *men- (3) "to remain"). Related: Remained; remaining.

remain (n.)

"those left over or surviving," mid-15c., from French remain, back-formation from Old French remanoir, remaindre, or else formed in Middle English from remain (v.). But the more usual noun in English has been remainder except in remains, euphemism for "corpse," attested from c. 1700, from mortal remains.

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Definitions of remain from WordNet

remain (v.)
stay the same; remain in a certain state;
The dress remained wet after repeated attempts to dry it
He remained unmoved by her tears
Synonyms: stay / rest
remain (v.)
continue in a place, position, or situation;
despite student protests, he remained Dean for another year
Synonyms: stay / stay on / continue
remain (v.)
be left; of persons, questions, problems, results, evidence, etc.;
Carter remains the only President in recent history under whose Presidency the U.S. did not fight a war
There remains the question of who pulled the trigger
remain (v.)
stay behind;
The hostility remained long after they made up
Synonyms: persist / stay