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null  audio  (nl) KEY 

ADJECTIVE:
  1. Having no legal force; invalid: render a contract null and void.
  2. Of no consequence, effect, or value; insignificant.
  3. Amounting to nothing; absent or nonexistent: a null result.
  4. Mathematics Of or relating to a set having no members or to zero magnitude.
TRANSITIVE VERB:
nulled, null·ing, nulls
To make null.
NOUN:
  1. Zero; nothing.
  2. An instrument reading of zero.

ETYMOLOGY:
French nul, from Old French, from Latin nllus; see ne in Indo-European roots


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