Provisional is an adjective that means temporary or makeshift, and there are many synonyms that can be used in its place. Some of the most common synonyms for provisional include interim, tentative, makeshift, stopgap, and trial. Other options to consider include acting, conditional, impermanent, and probationary. Each of these words conveys a slightly different shade of meaning, and the right choice will depend on the context and desired tone. For example, interim and acting might be used to describe leaders who are temporarily filling a role, while trial and probationary might be used to describe a period of testing or experimentation.