单词 | null |
释义 | null/nʌl /adjective 1 [predicative] Having no legal or binding force; invalid: the establishment of a new interim government was declared null and void...
Synonyms invalid, null and void, void; annulled, nullified, cancelled, abolished, revoked, rescinded, repealed 2Having or associated with the value zero.Poor exposure assessment, insofar as it is nondifferential, distorts the epidemiological measures of association toward the null value....
2.1 Mathematics (Of a set or matrix) having no elements, or only zeros as elements.Neither are accountable in terms of set theory: the null set is problematic and the class of all sets can only be discussed outside of the frame of set theory (as a ‘class’)!...
3Lacking distinctive qualities; having no positive substance or content: his curiously null life Synonyms lacking in character, empty, characterless, blank, colourless, expressionless, vacuous, insipid, vapid, inane noun 1 literary A zero. 2A dummy letter in a cipher.In other words, they cannot contain nulls or " / ‘characters.’ 3 Electronics A condition of no signal.A well-designed GPS receiver usually can recover from a deep signal null within approximately one second. 3.1A direction in which no electromagnetic radiation is detected or emitted.The null in the pattern is directed not only in the direction of the interference source, but also in the opposite direction where there might be desired GPS signals....
verb [with object] Electronics 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...
OriginLate Middle English: from French nul, nulle, from Latin nullus 'none', from ne 'not' + ullus 'any'.
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