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Constant

/ˈkɒnstənt/

A situation, state, or value that does not change.

Synonyms:

It lacked only a cyclotron for measuring nuclear constants.

Universal h soon acquired its modern name: Planck's constant.

There is a constant war between the two groups.

From Latin constans, the present participle of constare, meaning to stand firm, be steadfast.

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