< /ˌdaɪ əgˈnoʊ siz/.

  1. Medicine/Medical.
    1. the process of determining by examination the nature and circumstances of a diseased condition.
    2. the decision reached from such an examination. Abbreviation: Dx
  2. Biology. scientific determination; a description that classifies a group or taxon precisely.
  3. a determining or analysis of the cause or nature of a problem or situation.
  4. an answer or solution to a problematic situation.

noun plural -ses (-siːz)

    1. the identification of diseases by the examination of symptoms and signs and by other investigations
    2. an opinion or conclusion so reached
    1. thorough analysis of facts or problems in order to gain understanding and aid future planning
    2. an opinion or conclusion reached through such analysis
  1. a detailed description of an organism, esp a plant, for the purpose of classification

1680s, medical Latin application of Greek diagnosis “a discerning, distinguishing,” from stem of diagignoskein “discern, distinguish,” literally “to know thoroughly,” from dia- “apart” (see dia-) + gignoskein “to learn” (see gnostic).

n. pl. di•ag•no•ses (-sēz)

  1. The act or process of identifying or determining the nature and cause of a disease or injury through evaluation of patient history, examination, and review of laboratory data.
  2. The opinion derived from such an evaluation.
  3. A brief description of the distinguishing characteristics of an organism, as for taxonomic classification.

Plural diagnoses (dī′əg-nō′sēz)

  1. The identification by a medical provider of a condition, disease, or injury made by evaluating the symptoms and signs presented by a patient.
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