| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024null /nʌl/USA pronunciation adj. - lacking value or significance.
- being or amounting to nothing;
nil. - Mathematics(of a set)
- empty:A null set is a collection that has no members in it.
Idioms- Idioms null and void, without force or effect;
not valid:The contract is now null and void.
nul•li•ty, n. [uncountable]See -null-.-null-, root. - -null- comes from Latin, where it has the meaning "none;
not one.'' This meaning is found in such words as: annul, null, nullify.
WordReference Random House Unabridged Dictionary of American English © 2024null (nul),USA pronunciation adj. - without value, effect, consequence, or significance.
- being or amounting to nothing;
nil;
lacking;
nonexistent. - Mathematics(of a set)
- being or amounting to zero.
- Idioms null and void, without legal force or effect;
not valid:This contract is null and void.
n. - Electronicsa point of minimum signal reception, as on a radio direction finder or other electronic meter.
v.t. - to cancel;
make null.
- Latin nūllus, equivalent. to n(e) not + ūllus any
- 1555–65
Collins Concise English Dictionary © HarperCollins Publishers:: null /nʌl/ adj - without legal force; invalid; (esp in the phrase null and void)
- without value or consequence; useless
- lacking distinction; characterless
- nonexistent; amounting to nothing
- quantitatively zero
- relating to zero
- (of a set) having no members
- involving measurement in which an instrument has a zero reading, as with a Wheatstone bridge
Etymology: 16th Century: from Latin nullus none, from ne not + ullus any |