1
: the documents, records, etc., that are used to prove something or make something official
You cannot visit the country unless you have the proper documentation.
Keep your receipts as documentation of your purchases.
written documentation
Can you provide documentation of the claims you're making?
2
: written instructions for using a computer or computer program
The program's documentation is poorly written.
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“Documentation.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/documentation. Accessed 22 Jun. 2026.
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