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in the PONS Dictionary

I. du·pli·cate VB trans ['djuːplɪkeɪt]

to duplicate sth
to duplicate sth (repeat an activity)

II. du·pli·cate ADJ ['djuːplɪkət]

duplicate
duplicate key

III. du·pli·cate N ['djuːplɪkət]

duplicate
duplicate of a document
in duplicate
Present
Iduplicate
youduplicate
he/she/itduplicates
weduplicate
youduplicate
theyduplicate
Past
Iduplicated
youduplicated
he/she/itduplicated
weduplicated
youduplicated
theyduplicated
Present Perfect
Ihaveduplicated
youhaveduplicated
he/she/ithasduplicated
wehaveduplicated
youhaveduplicated
theyhaveduplicated
Past Perfect
Ihadduplicated
youhadduplicated
he/she/ithadduplicated
wehadduplicated
youhadduplicated
theyhadduplicated