something not absolute, but subject to conditions.

Conditional Conjunctions, in grammar, are those which serve to make propositions conditional; as if, unless, provided, &c.

Conditional Propositions, in logic, such as consist of two parts connected together by a conditional particle.

Conditional Syllogism, a syllogism where the major is a conditional proposition. Thus,

If there is a God, he ought to be worshipped. But there is a God; Therefore he ought to be worshipped.