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

    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

Word Family