1. (v. t.) Firm; solid; fixed; immovable; -- opposed to fluid.

2. (v. t.) Not liable, or given, to change; permanent; regular; continuous; continually recurring; steadfast; faithful; not fickle.

3. (v. t.) Remaining unchanged or invariable, as a quantity, force, law, etc.

4. (v. t.) Consistent; logical.

5. (n.) That which is not subject to change; that which is invariable.

6. (n.) A quantity that does not change its value; -- used in contradistinction to variable.