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say it: dyoo-pluh-KAY-shuhn
duplication is a noun meaning "a copy that corresponds to an original exactly". It carries 2 recorded senses.
a copy that corresponds to an original exactly
“he made a duplicate for the files”
the act of copying or making a duplicate (or duplicates) of something
“this kind of duplication is wasteful”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for duplication come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.