Etymology
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diagnosis (n.)

"scientific discrimination," especially in pathology, "the recognition of a disease from its symptoms," 1680s, medical Latin application of Greek diagnōsis "a discerning, distinguishing," from stem of diagignōskein "discern, distinguish," literally "to know thoroughly" or "know apart (from another)," from dia "between" (see dia-) + gignōskein "to learn, to come to know," from PIE root *gno- "to know."

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Definitions of diagnosis

diagnosis (n.)
identifying the nature or cause of some phenomenon;
Synonyms: diagnosing
From wordnet.princeton.edu