ENGLISH
REFERENCE

diagnosis

n.
US //ˌdaɪəɡˈnoʊsəs// UK //dˌaɪəɡnˈəʊsɪs// di·ag·no·sis
  1. 1 medical identification (n.)
    B2 Upper Intermediate Medicine

    the act of identifying a disease or illness after a doctor examines you.

    the identification of the nature and cause of a medical condition or illness through physical examination and testing.

    Example

    The doctor's diagnosis was correct, and the medicine started working within two days.

    Example

    Following a series of blood tests and an MRI scan, the specialist confirmed a diagnosis of early-stage arthritis.

    Usage

    The plural form is 'diagnoses', pronounced with a long 'e' sound at the end.

  2. 2 general analysis (n.)
    C1 Advanced Formal

    an opinion about the cause of a problem or situation that is not medical.

    the identification of the nature and cause of a non-medical phenomenon or problem.

    Example

    The consultant gave a clear diagnosis of why the company was losing money.

    Example

    The economist's diagnosis of the current market volatility pointed toward a lack of consumer confidence rather than high interest rates.

    Usage

    Often followed by the preposition 'of'.

Show 1 more senseShow fewer
  1. 3 biological description (n.)
    C2 Proficiency Technical Academic Science

    a detailed description of a plant or animal that shows how it is different from others.

    a formal description of a species or taxon that serves to distinguish it from related organisms.

    Example

    The scientist published a new diagnosis of the rare orchid found in the rainforest.

    Example

    The original diagnosis of the genus failed to account for the significant morphological variations observed in the recently discovered subspecies.

    Usage

    Historically, these descriptions were required to be published in Latin.

Origin

From Latin diagnōsis, from Ancient Greek διάγνωσις (diágnōsis), from διαγιγνώσκω (diagignṓskō, “to discern”), from διά (diá, “through”) + γιγνώσκω (gignṓskō, “to know”).

Word family

© 2026 English Reference