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I've been told that the natural frequency of an oscillator is the frequency an oscillator will oscillate at when left to itself. Is this referring to the frequency of an ideal oscillator subject to ONLY a restoring force. Because all REAL oscillators are subject to damping and, when left to themselves, will oscillate at a frequency different than the ideal case. Even if the difference is small for many cases, it is still different. So is the "natural frequency" the frequency a REAL oscillator will oscillate at when left to itself or is it the frequency of the ideal oscillator with no damping? Please don't refer me to a Wikipedia page. Thank you