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documentation (n.)

1754, "admonition, instruction, teaching," a sense now obsolete, noun of action from document (v.) or else from Medieval Latin documentationem (nominative documentio) "a reminding," from Latin documentum "example, proof, lesson," in Medieval Latin "official written instrument, authoritative paper" (see document (n.)). Meaning "preparation or use of documentary evidence" is by 1888. Scientific meaning "a collection and classification of informational papers" is from 1927.

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Definitions of documentation from WordNet

documentation (n.)
confirmation that some fact or statement is true through the use of documentary evidence;
documentation (n.)
program listings or technical manuals describing the operation and use of programs;
Synonyms: software documentation
documentation (n.)
documentary validation;
his documentation of the results was excellent
Synonyms: support
From wordnet.princeton.edu