How many letters does the top answer for “having similarity in size, shape, and relative position of corresponding parts” have?

The most common answer is symmetric (9 letters).

Crossword clue: having similarity in size, shape, and relative position of corresponding parts

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

symmetric 9 letters wn-def

having similarity in size, shape, and relative position of corresponding parts

symmetrical 11 letters wn-def

having similarity in size, shape, and relative position of corresponding parts