Definition of "myriad"

A myriad of beginnings to her intended discourse darted into her mind; but, as is usual in such cases, she chose the one the very worst suited to her purpose. "I never intend to marry," said she, in a faltering voice.

1834, L[etitia] E[lizabeth] L[andon], chapter XXIX, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), page 239

How far he surpassed them all may be felt if we remember that no Scythian, although the Scythians are reckoned by their myriads, has ever succeeded in dominating a foreign nation ...

1914, Henry Graham Dakyns, Xenophon, Cyropaedia, Book I

one night he would be singing at the barred window and yelling down out of the soft myriad darkness of a May night; the next night he would be gone [...].

1931, William Faulkner, Sanctuary, Vintage, published 1993, page 131

"As a clinician, it's a difficult symptom to treat," Cornelius said. "The end symptom may be the same, but what's causing it may be myriad."

2011 April 6–19, Kara Krekeler, "Researchers at Washington U. have 'itch' to cure problem", West End Word, 40 (7), p. 8

Driven by a perceived political need to adopt a hard-line stance, Mr. Cameron’s coalition government has imposed myriad new restrictions, the aim of which is to reduce net migration to Britain to below 100,000.

2013 September 28, Kenan Malik, “London Is Special, but Not That Special”, in New York Times, retrieved 28 September 2013