1. a very great or indefinitely great number of persons or things.
2. ten thousand.
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.
Starting before even her junior year of high school, a myriad of college mail descended upon her house, cluttering her rooms for weeks to come.