to make an exact copy of something

ठीक ठीक प्रति बनाना

English Usage: "Please duplicate this document for me."

Hindi Usage: "कृपया मेरे लिए इस दस्तावेज़ की ठीक ठीक प्रति बनाएं।"

a copy or replica of something

प्रतिकृति

English Usage: "She made a duplicate of the key."

Hindi Usage: "उसने चाबी की एक प्रतिकृति बनाई।"

being the same as something else

समान

English Usage: "They sent a duplicate invoice by mistake."

Hindi Usage: "उन्होंने गलती से एक समान चालान भेजा।"