How many letters does the top answer for “having a set of mutually perpendicular axes; meeting at right angles” have?

The most common answer is orthogonal (10 letters).

Crossword clue: having a set of mutually perpendicular axes; meeting at right angles

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

orthogonal 10 letters wn-def

having a set of mutually perpendicular axes; meeting at right angles

rectangular 11 letters wn-def

having a set of mutually perpendicular axes; meeting at right angles