Unchanged through time or space; permanent

• Tom was in constant pain.

  Tatoeba · CK · CC BY 2.0 FR

• You live in constant fear.

  Tatoeba · AlanF_US · CC BY 2.0 FR

Consistently recurring over time; persistent

Steady in purpose, action, feeling, etc

Firm; solid; not fluidrare

Consistent; logicalrare

Bounded above by a constantrare

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

• Change is the only constant.

  Tatoeba · saeb · CC BY 2.0 FR

• The only constant is change.

  Tatoeba · Hybrid · CC BY 2.0 FR

That which is permanent or invariable

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

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