Webster's English Dictionary

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null

1. null \'n*l\ aj [MF nul, lit., not any, fr. L nullus, fr. ne- not + 
   ullus)X any; akin to L unus one - more at NO, ONE 1: having no legal or 
   binding force : INVALID  2: amounting to nothing : NIL  3: having no value 
   : INSIGNIFICANT  4: having no members {~ sequence}  5: indicating usu. by a 
   zero reading on a scale when current or voltage is  zero 6: of, being, or 
   relating to zero 
2. null n 1: ZERO  2: a condition of a radio receiver when minimum or zero 
   signal is received