Etymology
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duplication (n.)

early 15c., "act of doubling," from Old French duplicacion (13c.) and directly from Latin duplicationem (nominative duplicatio), noun of action from past-participle stem of duplicare "to double" (see duplicate (adj.)). Sense of "act of making or repeating something essentially the same" is from 1580s. Meaning "a duplicate copy or version" is by 1872.

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Definitions of duplication

duplication (n.)
a copy that corresponds to an original exactly;
Synonyms: duplicate
duplication (n.)
the act of copying or making a duplicate (or duplicates) of something;
this kind of duplication is wasteful
Synonyms: gemination
From wordnet.princeton.edu