constantとは 意味・読み方・使い方

発音

• (英国発音) enPR: kŏn'stənt IPA: /ˈkɒnstənt/
• (米国発音) IPA: /ˈkɑnstənt/

形容詞

constant (comparative more constant, superlative most constant)

1. Unchanged through time or space; permanent.
2. Consistently recurring over time; persistent.

   Synonyms: see Thesaurus:continuous

   • 2013 November 16, Schumpeter, “The mindfulness business”, in The Economist, volume 409, number 8862:

     The constant pinging of electronic devices is driving many people to the end of their tether. Electronic devices not only overload the senses and invade leisure time. They feed on themselves: the more people tweet the more they are rewarded with followers and retweets.

3. Steady in purpose, action, feeling, etc.
   • c. 1580 (date written), Philippe Sidnei [i.e., Philip Sidney], “[The Second Booke] Chapter 3”, in [Fulke Greville; Matthew Gwinne; John Florio], editors, The Countesse of Pembrokes Arcadia [The New Arcadia], London: […] [John Windet] for William Ponsonbie, published 1590, →OCLC, folio 162, recto:

     Both loving one fair maid, they yet remained constant friends.

   • c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act V, scene ii]:

     I am constant to my purposes.

   • 1700, [John] Dryden, “Theodore and Honoria, from Boccace”, in Fables Ancient and Modern; […], London: […] Jacob Tonson, […], →OCLC:

     His gifts, his constant courtship, nothing gained.

4. Firm; solid; not fluid.
   • 1659 December 30 (date written), Robert Boyle, New Experiments Physico-Mechanicall, Touching the Spring of the Air, and Its Effects, (Made, for the Most Part, in a New Pneumatical Engine) […], Oxford, Oxfordshire: […] H[enry] Hall, printer to the University, for Tho[mas] Robinson, published 1660, →OCLC:

     If […] you mix them, you may turn these two fluid liquors into a constant body.

5. (obsolete) Consistent; logical.
   • c. 1601–1602 (date written), William Shakespeare, “Twelfe Night, or What You Will”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act IV, scene ii]:

     I am no more mad than you are: make the trial of it with any constant question.

6. (computing, complexity theory) Bounded above by a constant.

   constant time   constant space

同意語

• (unchanged through time or space): nonchanging, unaltering, unvarying; see also Thesaurus:changeless

派生語

名詞

constant (plural constants)

1. That which is permanent or invariable.
2. (algebra) A quantity that remains at a fixed value throughout a given discussion or operation.

   Antonym: variable

   Coordinate terms: parameter, metaparameter

   • 2015, Emanuel Carneiro, Damiano Foschi, Diogo Oliveira e Silva, Christoph Thiele, “A sharp trilinear inequality related to Fourier restriction on the circle”, in arXiv‎:

     We also establish that constants are local extremizers of the Tomas-Stein adjoint restriction inequality as well as of another inequality appearing in the program..

3. (sciences) Any property of an experiment, determined numerically, that does not change under given circumstances.

   Coordinate terms: parameter, metaparameter

   • 2015, Lenny H.E. Winkel et al., “Selenium Cycling Across Soil-Plant-Atmosphere Interfaces: A Critical Review”, in Nutrients‎, volume 7, →DOI:

     Based on their acid dissociation constants (pKa), seleneous acid (H2SeO3) and selenic acid (H2SeO4) are anionic under common environmental conditions [48], e.g., as selenite (SeO32−) and selenate (SeO42−).

4. (computing) An identifier that is bound to an invariant value; a fixed value given a name to aid in readability of source code.

派生語

関連する語

• constantly (adv)
• constancy (n)

参考

• (computing) literal