myriad

UK: /ˈmɪriəd/ US: /ˈmɪriəd/ ,(mir′ē əd)

WordReference Random House Learner's Dictionary of American English © 2025

myr•i•ad /ˈmɪriəd/   n. [countable]

1. a great number of persons or things:
   a myriad of problems.

adj. [before a noun]

2. of a great number;
   innumerable.

WordReference Random House Unabridged Dictionary of American English © 2025

myr•i•ad  (mir′ē əd), n. 

1. a very great or indefinitely great number of persons or things.
2. ten thousand.

adj. 

3. of an indefinitely great number;
   innumerable:
   the myriad stars of a summer night.
4. having innumerable phases, aspects, variations, etc.:
   the myriad mind of Shakespeare.
5. ten thousand.

• Greek mȳriad- (stem of mȳriás) ten thousand; see -ad¹
• 1545–55

myr′i•ad•ly, adv. 
Synonyms

• 4. countless, boundless, infinite, untold.

Collins Concise English Dictionary © HarperCollins Publishers::

myriad / ˈmɪrɪəd/ adjective

1. innumerable

noun

1. (also used in plural) a large indefinite number
2. ten thousand

Etymology: 16th Century: via Late Latin from Greek murias ten thousand