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oscillation

1. The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration.

2. Fluctuation; variation; change back and forth. His mind oscillated, undoubtedly; but the extreme points of the oscillation were not very remote. (Macaulay) axis of oscillation, Center of oscillation. See Axis, and Center.

Origin: L. Oscillatio a swinging.