remainder (n.)

late 14c., from Anglo-French remainder, Old French remaindre, noun use of infinitive, a variant of Old French 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"). The verb meaning "dispose of (books) at a reduced price" is from 1904. Related: Remaindered.

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Definitions of remainder from WordNet
remainder (n.)
something left after other parts have been taken away;
there was no remainder
Synonyms: balance / residual / residue / residuum / rest
remainder (n.)
the part of the dividend that is left over when the dividend is not evenly divisible by the divisor;
remainder (n.)
the number that remains after subtraction; the number that when added to the subtrahend gives the minuend;
Synonyms: difference
remainder (n.)
a piece of cloth that is left over after the rest has been used or sold;
Synonyms: end / remnant / oddment
remainder (v.)
sell cheaply as remainders;
The publisher remaindered the books