constant — English Dictionary

Adjective

1. Unchanged through time or space; permanent.

2. Consistently recurring over time; persistent.

   Examples

   More examples (1)

   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.

   Examples

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

   I am constant to my purposes.

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   His gifts, his constant courtship, nothing gained.

4. Firm; solid; not fluid.

   Examples

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

5. Consistent; logical.

   Usage

   • Obsolete

   Examples

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

6. Bounded above by a constant.

   Examples

   constant time constant space

Noun

1. That which is permanent or invariable.

2. A quantity that remains at a fixed value throughout a given discussion or operation.

   Antonyms

   variable

   Examples

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

   Examples

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

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

Adjective

1. unvarying in nature

   Synonyms

   changelessinvariantunvarying

   Examples

   maintained a constant temperature

   principles of unvarying validity

2. steadfast in purpose or devotion or affection

   Antonyms

   inconstant

   Examples

   a man constant in adherence to his ideals

   a constant lover

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   constant as the northern star

3. uninterrupted in time and indefinitely long continuing

   Synonyms

   ceaselessincessantnever-endingperpetualunceasingunremitting

   Examples

   the ceaseless thunder of surf

   in constant pain

   More examples (5)

   night and day we live with the incessant noise of the city

   the never-ending search for happiness

   the perpetual struggle to maintain standards in a democracy

   man's unceasing warfare with drought and isolation

   unremitting demands of hunger

Noun

1. a quantity that does not vary

   Synonyms

   constant quantityinvariable

   Broader terms

   quantity

2. a number representing a quantity assumed to have a fixed value in a specified mathematical context

   Broader terms

   number

   Examples

   the velocity of light is a constant