duplicatecheck
nounUK /ˈdjuːplɪkət tʃek/
US /ˈduːplɪkət tʃek/
A duplicate check is a way to see if something is copied or already there.
The computer does a duplicate check before it saves your new file.
OTHER MEANINGS
2. A test that looks for two things that are exactly the same.
The teacher ran a duplicate check on the test papers.
3. A step in a computer program that stops the same data from being saved twice.
The app uses a duplicate check to keep your list clean.
4. A careful look to make sure nothing was counted two times.
We did a duplicate check on the names before printing the list.