1. (noun) extra, duplicate
something additional of the same kind
Synonyms: duplication, spear carrier, duplicate, extra, supernumerary
Antonyms: different, mismatched
2. (adj) duplicate, duplication
a copy that corresponds to an original exactly
Synonyms: duplication, gemination, duplicate, extra
Antonyms: different, mismatched
3. (adj) duplicate
identically copied from an original
Synonyms: twin(a), twinned, matching
Antonyms: different, mismatched
4. (verb) duplicate, matching, twin(a), twinned
being two identical
Antonyms: different, mismatched
5. (verb) duplicate, reduplicate, double, repeat, replicate
make or do or perform again
Synonyms: double up, repeat, parallel, duplicate, reiterate, twin, geminate, recapitulate, retroflex, reprize, restate, recur, reprise, iterate, double over, ingeminate, echo, replicate, retell, take over, reduplicate, double, copy
Antonyms: mismatched, different
6. (verb) twin, duplicate, parallel
duplicate or match
Synonyms: pair, twin, collimate, reduplicate, double, duplicate, parallel, repeat, couple, replicate, match, mate
Antonyms: different, mismatched
7. (verb) duplicate
make a duplicate or duplicates of
Synonyms: repeat, replicate, double, reduplicate, twin, parallel
Antonyms: mismatched, different
8. (verb) double, duplicate
increase twofold
Synonyms: double up, twin, parallel, reduplicate, double, duplicate, repeat, replicate, double over
Antonyms: mismatched, different
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Synonyms and Antonyms of duplicate 
