How many letters does the top answer for “the act of propelling” have?

The most common answer is actuation (9 letters).

Crossword clue: the act of propelling

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

actuation 9 letters wn-def

the act of propelling

propulsion 10 letters wn-def

the act of propelling

the act of propelling with force 67% similar → launch