l) process of identifying a causal agent by analyzing signs. symptoms. site conditions. patterns. climate. cultural history. and other factors. 2) the conclusion from the process.

Merriam-Webster Online Dictionary
diagnosis (noun)
a) the art or act of identifying a disease from its signs and symptoms
b) the decision reached by diagnosis
a concise technical description of a taxon
a) investigation or analysis of the cause or nature of a condition, situation, or problem - diagnosis of engine trouble
b) a statement or conclusion from such an analysis
diagnosis (Wikipedia)

Diagnosis is the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines, with variations in the use of logic, analytics, and experience, to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions.

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