Pronunciation IPA (key): /ˈpɛnd͡ʒələm/ or /ˈpɪnd͡ʒələm/ Audio (US)(file) Noun Singular pendulum Plural pendulums (countable) A pendulum is a weight that is suspended from a fixed support so that it swings freely back and forth. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads