Definition of knowable
: capable of being known : able to be determined or understood
This year, California votes March 3, and whether it offers a delegate haul for one candidate or a scramble between several candidates is not yet knowable.— David Weigel At the end of any year, a fixed and knowable number of us will have developed heart disease, and another number won't have.— Jeffrey Kluger and Alice Park A smear of orange tells everything knowable about light when it collides with the bottom of a copper pot.— Peter Schjedlahl
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Merriam-Webster unabridged
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Time Traveler for knowable
The first known use of knowable was in the 15th century
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