English Reference
noun

plethora

n.
US /ˈpɫɛθɝə/ UK /plˈɛθəɹɐ/ pletho·ra UK spelling plethoras

  1. 01 C1 Advanced AcademicFormal

    a very large amount of something, especially more than you need.

    an excessive amount or number; an abundance that may feel overwhelming.

    Simple

    The website offers a plethora of information, which can be a bit confusing.

    In context

    The report cited a plethora of reasons for the project's failure, ranging from poor budget management to a lack of clear leadership.

    Usage

    Usually followed by the preposition 'of' and a plural noun.

    Pitfall
    There are a plethora of options. There is a plethora of options.

    Although it refers to many things, 'plethora' is a singular noun and usually takes a singular verb.

  2. 02 C2 Proficiency Technical Medicine

    a medical condition where there is too much blood in the body or a specific area, like the face.

    a bodily condition characterized by an excess of blood or other fluids; often manifests as a reddish complexion.

    Simple

    The doctor noticed a plethora in the patient's face, suggesting high blood pressure.

    In context

    Clinical observation revealed a marked plethora, indicating a significant increase in total blood volume that required immediate diagnostic attention.

    hyperemiacongestion

These surveys yielded a plethora of astronomical discoveries, including that the universe is expanding.

The Conversation· 27 Aug 2026

Over the past year, we’ve seen a plethora of new announcements in a category labeled “world models,” and you’ll likely see more movement there in the coming months and years.

Ars Technica· 13 Jul 2026

From Late Latin plēthōra, from Ancient Greek πληθώρη (plēthṓrē, “fullness, satiety”), from πλήθω (plḗthō, “to be full”) + -η (-ē, nominal suffix).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Ancient Greek πληθώρη
Level C1 · Advanced
Frequency Frequent
Updated