Constant

constant

In programming, a fixed value in a program. Minimum and maximum amounts, dates, prices, headlines and error messages are examples.

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constant

1. a specific quantity that is always invariable

2. 

a. Maths a symbol representing an unspecified number that remains invariable throughout a particular series of operations

b. Physics a theoretical or experimental quantity or property that is considered invariable throughout a particular series of calculations or experiments

3. See logical constant
http://physics.nist.gov/cuu/Constants/index.html

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constant [′kän·stənt]

(science and technology)

A value that does not change during a particular process.

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Constant 

in prosody, a constant element in the rhythmic organization of verse; mainly, a constant stress on a certain syllable. Thus, in the verse of M. Iu. Lermontov’s narrative poem Mtsyri, the constant is the constant word boundary after each eighth syllable (boundary of the verse) and the constant stress on the last, eighth syllable of each segment.

Vse luchshe pered kem-nibúd’
Slovami oblegchit’ mne grúd;
No liudiam ia ne delal zlá,
I potomu moi delá
Ne mnogo pol’zy vain uznát’;
A dushu mozhno l’ rasskazát’? … 

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Constant 

a quality that has the same value throughout a given discussion. The constancy of the quality x can be expressed symbolically as x = const. Constants are often represented by the letters C and K.