Answer: The suffix in the word "predictable" is "-able" and its meaning is "capable of".
Step-by-step explanation: The suffix "-able" refers to something that can be done. Therefore, its meaning is "capable of". Moreover, the suffix "-able" is generally affixed to a verb, something that leads to a change in word category. In the word "predictable", the suffix is "-able" and the root is a verb ("predict"). In that way, the addition of the suffix "-able" leads to a change in word category since "predictable" is an adjective. The word "predictable" is used to describe something or someone as able to be predicted.