cosmic microwave background radiation is a noun meaning "(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin". It carries one recorded sense.
(cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin
cosmology
Definitions, synonyms and semantic relations for cosmic microwave background radiation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.