motherworld n.

There was the likeness of the mother world itself—two circles in which the outlines of Earth’s continents had been carved.

He realized that his mother world from which he had come in exile was lost among the tiny pin points of the farflung curtain of space.

Inevitably the new worlds began to loosen their ties with Earth. Their populations were still very small compared with those of the mother world but they contained the most brilliant and active minds the race possessed.

There are so many things for an undergraduate to learn about our own world—Mars—that we try to discourage you from getting started on the endless succession of inquiries about the Motherworld.

The arks preserve such fragmentary codes as have been recovered…from the last pre-mixing genepools of the motherworld.

Straum welcomed folk from the mother world; their enterprise was less than one hundred years old.

Elliptical tracks described their orbits around the Earth, the white about the equator, the red at a forty-five degree angle to the ecliptic plane of the motherworld.