noun
(medicine, countable, uncountable) The process of, or an instance of, identification of the nature and cause of a medical condition or illness.
The process of, or an instance of, identification of the nature and cause of something (of any nature).
(taxonomy) A written description of a species or other taxon serving to distinguish that species from all others; especially a description written and published in Latin.
verb
(nonstandard, proscribed, rare) Synonym of diagnose.