"Conditional on" means that one thing depends on another or that one thing must happen before another can occur. Some synonyms for "conditional on" include "contingent upon," "subject to," "depending on," "hinging on," "relying on," and "predicated on." These phrases convey the same idea that an event or action is necessary for something else to happen. The use of synonyms can add variety and clarity to writing and help avoid repetition. When choosing the appropriate synonym to replace "conditional on," consider the context, tone, and intended meaning of the sentence.