apollo program is a noun meaning "a program of space flights undertaken by US to land a man on the Moon". It carries one recorded sense.
a program of space flights undertaken by US to land a man on the Moon
“the first lunar landing was achieved by the Apollo program on July 20, 1969”
Definitions, synonyms and semantic relations for apollo program come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.