sharply or clearly stated, outlined, described, etc.: a well-defined character; a well-defined boundary.


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World English Dictionary
clearly delineated, described, or determined

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Example sentences
Clean design, well-defined spaces, and meticulous attention to detail make even
  a small corner lot seem spacious and private.
According to quantum mechanics, electrons don't have well-defined orbits around
  atoms, as the planets do around the sun.
In microwave atomic clocks, the well-defined resonance of a cesium atom is the
  reference point.
Modern travel gives us certainty and well-defined timetables-and sucks all of
  the sentiment out of our departures.
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