How many letters does the top answer for “a belief (or system of beliefs) accepted as authoritative by some group or school” have?

The most common answer is doctrine (8 letters).

Crossword clue: a belief (or system of beliefs) accepted as authoritative by some group or school

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

doctrine 8 letters wn-def

a belief (or system of beliefs) accepted as authoritative by some group or school

ism 3 letters wn-def

a belief (or system of beliefs) accepted as authoritative by some group or school

philosophy 10 letters wn-def

a belief (or system of beliefs) accepted as authoritative by some group or school