Mesozoic has 4 different meanings across 3 categories:
Noun · Adjective · Proper Noun
from 230 million to 63 million years ago
of or relating to or denoting the Mesozoic era
Of a geologic era within the Phanerozoic eon that comprises the Triassic, Jurassic and Cretaceous periods from about 230 to 65 million years ago, when life on earth was dominated by reptiles.
The Mesozoic era.