English to English

noun (n)

• free from obscurity and easy to understand; the comprehensibility of clear expression(noun.attribute)

  Synonym:
  clarity, clearness, limpidity, lucidity, lucidness
  Antonym:
  unclearness
  

  source: wordnet30
• passing light without diffusion or distortion(noun.attribute)

  Synonym:
  limpidity, pellucidness
  

  source: wordnet30
• The quality or state of being pellucid; transparency; translucency; clearness; as, the pellucidity of the air.(noun)

  source: webster1913