| 单词 | null | 
| 释义 | null1 of 3adjective   ˈnəl   1    : having no legal or binding force : invalid  a null contract   2    : amounting to nothing : nil  the null uselessness of the wireless transmitter that lacks a receiving station   3    : having no value : insignificant  … news as null as nothing …   4   a     : having no elements (see element sense b(3))  null set    b     : having zero as a limit  null sequence    c    of a matrix   : having all elements equal to zero   5   a     : indicating usually by a zero reading on a scale when a given quantity (such as current or voltage) is zero or when two quantities are equal  —used of an instrument    b     : being or relating to a method of measurement in which an unknown quantity (as of electric current) is compared with a known quantity of the same kind and found equal by a null detector   6    : of, being, or relating to zero  The meter gave a null reading.   7    : zero sense 1c   null 2 of 3noun1    : zero sense 3a(1)   2   a     : a condition of a radio receiver when minimum or zero signal is received    b     : a minimum or zero value of an electric current or of a radio signal   null 3 of 3verb  nulled; nulling; nulls    transitive verb   : to make null   null 1 of 2 adjective1  as in void   having no legal or binding force the contract was null because one party forgot to sign it   Synonyms & Similar Words Relevance     
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 2  as in worthless   having no usefulness that information is as null as no information at all   Synonyms & Similar Words 
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 null 2 of 2verbas in to void   to put an end to by formal action asked the state court to null the election results because of widespread voting irregularities   Synonyms & Similar Words 
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