It is a super-continent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago.
It used to be one big continent that was connected that had eventually broke into many parts.
That is the meaning of it online.
Pan·gae·a
[panˈjēə]
DEFINITION
a supercontinent comprising all the continental crust of the earth, postulated to have existed in late Paleozoic and Mesozoic times before it broke into Gondwana and Laurasia.