cosmic microwave background

noun

Definition of cosmic microwave background

1981

First Known Use of cosmic microwave background

1981


Seen and Heard

What made you want to look up cosmic microwave background? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

the point at which something begins

Get Word of the Day daily email!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!