By contrast, exercising requires you to commit your willpower for only a short, well-defined period of time.
Such a stream begins in the hills with a well-defined boulder-strewn bed, which is never dry.
There was a manifest need of some well-defined piratical purpose.
His first crime may present many features to indicate that he is more the victim of circumstances than well-defined ill-will.
There is no well-defined timber-line, as on other lofty mountains.
History, like an individual's life, is a succession of well-defined periods.
Here was a dilemma—a dilemma none the less for having two well-defined horns.
It is a step—not long, yet well-defined—from thought to idea.
He had a well-defined code to regulate his relations with others and theirs with him.
They are more or less heavily marked with well-defined spots and dots of pale chocolate and reddish brown.