diagnosis diagnoses • diagnostic · · · Info · Definitions · Synonyms · Characters · · diagnosis · · Text Latin · · Script 9 · · Length Definitions · · · (noun) identifying the nature or cause of some phenomenon. Synonyms: diagnosing. · · Noun Definition 1 Synonyms · · · diagnosing · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073