Look up **constant** in Wiktionary, the free dictionary.

**Constant** or **The Constant** may refer to:

- Constant (mathematics), a non-varying value
- Mathematical constant, a special number that arises naturally in mathematics, such as π or e

- Control variable or scientific constant, in experimentation the unchanging or constant variable
- Physical constant, a physical quantity generally believed to be universal and unchanging
- Constant (computer programming), a value that, unlike a variable, cannot be reassociated with a different value
- Logical constant, a symbol in symbolic logic that has the same meaning in all models, such as the symbol "=" for "equals"

- Constant (given name)
- Constant (surname)
- John, Elector of Saxony (1468–1532), known as John the Constant
- Constant Nieuwenhuys (1920-2005), better known as Constant

- Constant, Barbados, a populated place

- "The Constant", a 2008 episode of the television show
*Lost* *The Constant*(Story of the Year album)*The Constant*(I Blame Coco album)- Constants (band), an American rock band

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