Origin: Latin suffix -able
Predictable has 2 different meanings across 1 category:
capable of being foretold
"The weather forecast proved to be accurate because the storm patterns were highly predictable."
Able to be predicted.
"The weather forecast proved accurate because the storm's path was predictable based on past data."
The word is formed by adding the suffix -able to predict, meaning it was made capable of being predicted. This construction directly reflects its current definition without requiring a shift in original meaning.