Oscillator/ˈɑːsɪleɪtər/ Definition 1 of 3Pro Tip 1/3Technical Usage Used mainly in science and tech, 'oscillator' might sound too formal in casual conversation. The lab's oscillator maintains the temperature cycles. Pro Tip 2/3Repetitive Nature 'Oscillator' implies something that moves back and forth or cycles regularly. An oscillator can control the pulse of the lights. Pro Tip 3/3Variety of Types There are many types of oscillators such as electronic, mechanical, and optical. A mechanical oscillator could be found in old-fashioned clocks.