How many letters does the top answer for “of or pertaining to an ecclesiastical chapter” have?

The most common answer is capitular (9 letters).

Crossword clue: of or pertaining to an ecclesiastical chapter

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

capitular 9 letters wn-def

of or pertaining to an ecclesiastical chapter

capitulary 10 letters wn-def

of or pertaining to an ecclesiastical chapter