"Clearly defined" is a phrase used to describe something that is easy to understand and distinguish from similar concepts. Some synonyms for this phrase include "well-defined," "precisely stated," "unambiguously outlined," "distinctly elucidated," and "crisply articulated." These synonyms convey the idea that the boundaries and characteristics of the concept in question have been clearly delineated and are not subject to confusion or misunderstanding. Whether discussing a scientific theory, a legal argument, or a personal philosophy, using language that is clearly defined can help ensure that ideas are communicated effectively and understood accurately.