A good word definition should be characterized by its lucidity, or clarity. In other words, it should be clear and easy to understand — like this one.

Lucidity comes from the Latin lucidus meaning "light, bright, clear." Certainly when something is light, bright, and clear, it's ripe with the quality of lucidity. An easy-to-read textbook is characterized by lucidity. A person too can possess a quality of lucidity, one that would allow her to express ideas as clearly as possible.

Definitions of lucidity
  1. noun
    free from obscurity and easy to understand; the comprehensibility of clear expression
    synonyms: clarity, clearness, limpidity, lucidness, pellucidity
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    abstruseness, obscureness, obscurity, reconditeness
    the quality of being unclear or abstruse and hard to understand
    incomprehensibility as a result of not being clear
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    having a single meaning (absence of ambiguity) usually of individual words or phrases
    maximum clarity or distinctness of an idea
    clearcutness, preciseness
    clarity as a consequence of precision
    perspicuity, perspicuousness, plainness
    clarity as a consequence of being perspicuous
    unambiguity, unequivocalness
    clarity achieved by the avoidance of ambiguity
    clarity as a consequence of being explicit
    type of:
    comprehensibility, understandability
    the quality of comprehensible language or thought
  2. noun
    a lucid state of mind; not confused
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    type of:
    saneness, sanity
    normal or sound powers of mind
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