All day and night; all of the time.
Consistently recurring over time; persistent.
Firm; solid; not fluid.
Unchanged through time or space; permanent.
Steady in purpose, action, feeling, etc.
Bounded above by a constant.
A quantity that remains at a fixed value throughout a given discussion.
Any property of an experiment, determined numerically, that does not change under given circumstances.
That which is permanent or invariable.
An identifier that is bound to an invariant value; a fixed value given a name to aid in readability of source code.