Continuing; prolonged; sustained.
An endurant.
A determinant formed from a tridiagonal matrix.
A linguistic sound other than a stop.
Permanent, lasting; constant, perpetual.
We had to wait forever to get inside.
For all time, for all eternity; for a lifetime; for an infinite amount of time.
For a very long time, a seeming eternity.
Constantly or frequently.
An extremely long time.
A mythical time in the infinite future that will never come.