Webster's English Dictionary

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diagnosis

di.ag.no.sis \.di--ig-'no--s*s\ \-'no--.se-z\ n or di.ag.no.ses [NL, fr Gk 
   diagno-sis, fr. diagigno-skein to distinguish, fr.] pl  dia- + gigno-skein 
   to know - more at KNOW 1: the art or act of identifying a disease from its 
   signs and symptoms  2: a concise technical description of a taxon  3a: 
   investigation or analysis of the cause or nature of a condition, situat 
   ion, or problem 3b: a statement or conclusion concerning the nature or 
   cause of some phenom enon