1. existing as an exact copy or in two identical versions

1. past tense and past participle of duplicate; made an exact copy of something

Examples

• She duplicated the key so her roommate could have one too.
• The scientist duplicated the experiment to verify the results.
• All the duplicated files were stored in a backup folder.
• The duplicated documents caused confusion in the filing system.
• He accidentally duplicated his efforts by doing the same work twice.
• The duplicated data took up unnecessary storage space.