How many letters does the top answer for “having many parts or aspects” have?

The most common answer is multiplex (9 letters).

Crossword clue: having many parts or aspects

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

multiplex 9 letters wn-def

a movie theater than has several different auditoriums in the same building

having many aspects or qualities 60% similar → multifaceted, multifarious

having many parts or sides 60% similar → multilateral

divided into many parts; having several parts. 50% similar → multipartite