How many letters does the top answer for “the quality of being predictable with great confidence” have?

The most common answer is definiteness (12 letters).

Crossword clue: the quality of being predictable with great confidence

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

definiteness 12 letters wn-def

the quality of being predictable with great confidence

determinateness 15 letters wn-def

the quality of being predictable with great confidence

the quality of being predictable 60% similar → predictability