How many letters does the top answer for “mechanics philosopher” have?

The most common answer is dalembert (9 letters).

Crossword clue: mechanics philosopher

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

dalembert 9 letters wd-fact-v3

poincare 8 letters wd-fact-v3

celestial mechanics philosopher 67% similar → poincare

quantum mechanics philosopher 67% similar → heitler

philosopher philosopher 50% similar → lipps