(philosophy) In the philosophy of science, the view that concepts and theories are merely useful instruments whose worth is measured not by whether the concepts and theories are true or false (or correctly depict reality), but how effective they are in explaining and predicting phenomena.

plural of instrumentalism

(uncountable) The quality or condition of being instrumental; serving a purpose, being useful. / (countable, law) A governmental organ with a specific purpose.

By means of an instrument or agency; as means to an end / With instruments of music

(rare) Usefulness or agency, as means to an end; instrumentality / (music) How likely the music contains no spoken word vocals

essential or central; of great importance or relevance. / Serving as an instrument, medium, means, or agency.

(grammar) The instrumental case. / (music) A composition written or performed without lyrics, sometimes using a lead instrument to replace vocals.

simple past tense and past participle of instrument

present participle of instrument

(transitive) To apply measuring devices. / (transitive) To devise, conceive, cook up, plan. / To perform upon an instrument; to prepare for an instrument.