piano action is a noun meaning "action consisting of a system of levers that move a felt hammer to strike the strings when a key is depressed". It carries one recorded sense.
action consisting of a system of levers that move a felt hammer to strike the strings when a key is depressed
Definitions, synonyms and semantic relations for piano action come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.