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rationale
Definition: (noun) an underlying reason or explanation.
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sound2  audio  (sound) KEY 

ADJECTIVE:
sound·er, sound·est
  1. Free from defect, decay, or damage; in good condition.
  2. Free from disease or injury. See Synonyms at healthy.
  3. Having a firm basis; unshakable: a sound foundation.
  4. Financially secure or safe: a sound economy.
    1. Based on valid reasoning: a sound observation. See Synonyms at valid.
    2. Free from logical flaws: sound reasoning.
    3. Logic Of or relating to an argument in which all the premises are true and the conclusion follows from the premises.
  6. Thorough; complete: a sound flogging.
  7. Deep and unbroken; undisturbed: a sound sleep.
  8. Free from moral defect; upright.
  9. Worthy of confidence; trustworthy.
  10. Marked by or showing common sense and good judgment; levelheaded: a sound approach to the problem.
  11. Compatible with an accepted point of view; conservative.
  12. Law Legally valid.
ADVERB:
Thoroughly; deeply: sound asleep.
ETYMOLOGY:
Middle English, from Old English gesund

OTHER FORMS:
soundly(Adverb), soundness(Noun)


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