Oscillation
the vibration of reciprocal ascent and descent of a pendulous body. The problem of oscillation, in its widest sense, includes most of those To their average motions, th which occur in astronomy, optics, etc. motions, the moon and planets_add small oscillations about their mean places; the tides consists of oscillations of the ocean, etc. In general language, however, the problem of oscillation refers only to the purely theoretical part of the problem of the pendulum.