Online Google Dictionary

null 中文解釋 wordnet sense Collocation Usage Collins Definition
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Having no legal or binding force; invalid,
  1. Having no legal or binding force; invalid
    • - the establishment of a new interim government was declared null and void
  2. Having or associated with the value zero

  3. (of a set or matrix) Having no elements, or only zeros as elements

  4. Lacking distinctive qualities; having no positive substance or content
    • - his curiously null life
  1. Combine (a signal) with another in order to create a null; cancel out

  1. A zero

  2. A dummy letter in a cipher

  3. A condition of no signal

  4. A direction in which no electromagnetic radiation is detected or emitted

  1. lacking any legal or binding force; "null and void"
  2. nothing: a quantity of no importance; "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn't hear zilch about it"
  3. The null character (also null terminator) is a character with the value zero, present in the ASCII and Unicode character sets and the C0 control code, and available in nearly all mainstream programming languages.
  4. Null, called also Null the Living Darkness, is a fictional character in the Marvel Universe.
  5. Null is an EP by Foetus, released in 1995 by Big Cat Records in the UK. Null acts as a de facto single for "Verklemmt," released on Gash.
  6. Null is the first EP by the American post-metal band Intronaut.
  7. In mathematics, the word null (from German null, which is from Latin nullus, both meaning "zero", or "none") means of or related to having zero members in a set or a value of zero. Sometimes the symbol ∅ is used to distinguish "null" from 0.
  8. In physics a null is a point in a field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other. The field may be scalar, vector or tensor in nature. ...
  9. A non-existent or empty value or set of values; Zero quantity of expressions; nothing; the ASCII or Unicode character (␀), represented by a zero value, that indicates no character and is sometimes used as a string terminator; the attribute of an entity that has no valid value; to nullify; ...
  10. (Nulls) Meaningless letters used to confuse by modifying frequency distributions or predictability. Sometimes used to fill a message to a specific length.
  11. (Nulls) In an antenna, near zero-level signals of sharp angular width seen in a radiation pattern. The opposite of lobes.
  12. (nulls) Unknown values in a column or field
  13. In mathematics, a set with no members or of zero magnitude. If a field has a value of null, it means that the value is unknown. A null value is not the same as a value of zero. (To appreciate the difference, consider the terms "free" and "priceless." If something is free, it has a price of zero. ...
  14. A condition, such as balance, which results in a minimum absolute value of output.
  15. The zone just below audible threshold in metal detector tuning. This also refers to the momentary drop or quiet response of threshold sound as the searchcoil passes over a discriminated or rejected target.
  16. adj., n. 1. adj. a. (of a list) having no elements: empty. See empty list. b. (of a string) having a length of zero. ...
  17. Complete loss of function phenotype. This term is used in reference to the mutation or inactivation of specific genes, resulting in complete absence of protein expression.
  18. Dummy letter, letter symbol, or code group inserted into an encrypted message to delay or prevent its decryption or to complete encrypted groups for transmission or transmission security purposes. [CNSSI] (see also code, message, security)
  19. a    character having no meaning, in the sense that it does not cause any action and holds no meaningful value. Null can be used for many purposes, such as receiving test output in a program, to separate blocks of information, or to terminate strings.
  20. A null constituent is one which is 'silent' or 'unpronounced' and so has no overt phonetic form. See ch.4.
  21. A low or minimum point on a graph. A minimum pressure region in a room.
  22. A Java keyword. The non-value with which an unbound label name is associated.
  23. Texture(s) that is missing or can not be found. These null textures are given a default texture used by the engine (The green bubbly texture).
  24. Nothing. Empty. Zero. A "null packet" is one that does not contain any information; it usually means that the network's transport layer is clear and ready for a new packet. Mentioned in: Network Communication.
  25. a negative, no value, a false expression.