Something that is capable of being in the future or is able to happen at a future time.
From future + -able suffix; the Latin 'futurus' (about to be) plus the Germanic '-able' (capable of being).
This is a delightfully rare word that philosophers and science fiction writers might love—it reminds us that English lets us combine simple words in creative ways to express ideas that barely exist elsewhere.
Complete word intelligence in one call. Free tier — 50 lookups/day.