How many letters does the top answer for “capable of being verified; confirmable. bp. hall.” have?

The most common answer is verifiable (10 letters).

Crossword clue: capable of being verified; confirmable. bp. hall.

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

verifiable 10 letters web-def

capable of being tested (verified or falsified) by experiment or observation

capable of being paralleled, or equaled. bp. hall. 50% similar → parallelable

capable of being put in opposition. bp. hall. 50% similar → oppositive