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The Collaborative International Dictionary of English v.0.48 (gcide)

Diagnosis \Di`ag*no"sis\, n.; pl. {Diagnoses}. [NL., fr. Gr. ?,
fr. ? to distinguish; dia` through, asunder ? to know. See
{Know}.]
1. (Med.) The art or act of recognizing the presence of
disease from its signs or symptoms, and deciding as to its
character; also, the decision arrived at.
[1913 Webster]

2. Hence, the act or process of identifying the nature or
cause of some phenomenon, especially the abnormal behavior
of an animal or artifactual device; as, diagnosis of a
vibration in an automobile; diagnosis of the failure of a
sales campaign; diagnosis of a computer malfunction.
[PJC]

3. Scientific determination of any kind; the concise
description of characterization of a species.
[1913 Webster]

4. Critical perception or scrutiny; judgment based on such
scrutiny; esp., perception of, or judgment concerning,
motives and character.
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The quick eye for effects, the clear diagnosis of
men's minds, and the love of epigram. --Compton
Reade.
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My diagnosis of his character proved correct. --J.
Payn.
[1913 Webster]

{Differential diagnosis} (Med.), the determination of the
distinguishing characteristics as between two similar
diseases or conditions.
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