English Reference
noun · adjective

myriad

n. · adj.
US /ˈmɪɹiəd/ UK /mˈɪɹɪˌæd/ myr·i·ad UK spelling myriads

  1. 01 C1 Advanced Formal

    n.a very large or countless number of people or things.

    n.an indefinitely great number; a vast multitude.

    Simple

    The city offers a myriad of activities for tourists during the summer months.

    In context

    The researcher was overwhelmed by the myriad of conflicting data points that emerged during the final phase of the clinical trial.

    Usage

    Often used in the construction 'a myriad of' followed by a plural noun.

    Teacher's tip

    Traditionalists sometimes argue against 'a myriad of', preferring the adjective use, but both are standard in modern formal English.

    Pitfall
    There are myriad of reasons to go. There are a myriad of reasons to go. / There are myriad reasons to go.

    When using myriad as a noun, you need 'a' and 'of'. As an adjective, you use it directly before the noun.

  2. 02 C1 Advanced LiteraryFormal

    adj.extremely great in number; too many to count.

    adj.constituting a very large, indefinite number; innumerable.

    Simple

    We gazed up at the myriad stars shining in the clear night sky.

    In context

    The new policy faced myriad challenges from local community leaders who feared the economic impact on small businesses.

    Usage

    Placed directly before the noun it modifies.

    limitedcountable
  3. 03 C2 Proficiency ArchaicTechnical

    n.the number ten thousand, especially in ancient Greek history.

    n.the number ten thousand; historically used in translations of Greek and Latin texts.

    Simple

    The ancient army was divided into units of a myriad each.

    In context

    In classical Greek numeration, the myriad represented the largest named power of ten.

    Usage

    Rarely used in modern contexts except when discussing historical military or mathematical systems.

    Teacher's tip

    This is the original meaning of the word; students will likely only encounter it in history books or classical literature.

    ten thousand

Growing up, I always thought I was carrying around myriad health problems, but this year, I discovered they were all connected to my bendy joints.

BBC News· 27 Aug 2026

Since the site's discovery in the late 1800s, it has produced a myriad of pottery, figurines and carefully carved bone tools.

Phys.org· 22 Aug 2026

From French myriade, from Late Latin mȳriadem (accusative of mȳrias), from Ancient Greek μυριάς (muriás, “number of 10,000”), from μυρίος (muríos, “numberless, countless, infinite”).

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

This entry
Level C1 · Advanced
Frequency Frequent
Updated