1. exact copies of something
Usage: plural of duplicate

1. makes exact copies of something
Usage: third person singular present tense
2. repeats or does something again unnecessarily
Usage: third person singular present tense

Examples

• She made duplicates of all the important documents.
• The office keeps duplicates of every contract in the filing cabinet.
• The machine duplicates keys in just a few minutes.
• He duplicates his efforts by checking the same data twice.
• The system automatically duplicates backup files every night.
• Please avoid creating duplicates when entering customer information.
• The printer duplicates whatever appears on the computer screen.