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1. Oxford Dictionary

   null

   • IPA[nʌl]

   英式

   • adj.
     having no legal or binding force; invalid；having or associated with the value zero.
   • n.
     a zero.；a dummy letter in a cipher.
   • v.
     combine (a signal) with another in order to create a null; cancel out

   • noun: null, plural noun: nulls

2. • 釋義

   adj.

   形容詞

   • 1. having no legal or binding force; invalid the court ruled that the contract contained several infringements and therefore declared it null and void 同義詞 invalid, null and void, void, annulled, nullified, ... 更多cancelled, abolished, revoked, rescinded, repealed反義詞 valid
   • 2. having or associated with the value zero.
   • ▪ (of a set or matrix) having no elements, or only zeros as elements.
   • 3. lacking distinctive qualities; having no positive substance or content his curiously null life 同義詞 lacking in character, empty, characterless, blank, colourless, ... 更多expressionless, vacuous, insipid, vapid, inane反義詞 full, colourful, interesting

   n.

   名詞

   • 1. literary a zero.
   • 2. a dummy letter in a cipher.
   • 3. a condition of no signal.
   • ▪ a direction in which no electromagnetic radiation is detected or emitted.

   v.

   動詞

   • 1. combine (a signal) with another in order to create a null; cancel out the tumour can be more readily identified by nulling the high signal from bone marrow