Tabuko had no definite boundary except for natural landmarks such as the mountain, hills and lake.

This was the time that Tabuko had a definite boundary.

Aldebaran had been no more than an island in a forbidding void, and so he was used to a life within definite boundaries.

The Earth's atmosphere has no definite boundary, slowly becoming thinner and fading into outer space.

Though knowledge has no limits, he mused, the human capacity for learning has definite boundaries.

The self-differentiated individual is said to have definite boundaries between inner characteristics identified as self and the social environment.

As our information is several years old, more subareas may now have protection stations and definite boundaries.

And as such, it has no definite boundaries.

He was more comfortable with that, since it seemed to give the world a definite boundary.

The fishbowl may be a complete sphere, but it has a definite boundary.