D defs.my
Entry 2 senses Webster, 1913

Oscillation

/äsˌ-əl-āsh'-ən/ · Os·cil·la·tion · IPA /ˌɑː.səˈleɪ.ʃən/
01 n. The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration.
  1. 1.
    The act of oscillating; a swinging or moving backward and forward, like a pendulum; vibration.
  2. 2.
    Fluctuation; variation; change back and forth.
    “His mind oscillated, undoubtedly; but the extreme points of the oscillation were not very remote.” Macaulay.
Phrases & compounds
Axis of oscillation — See under Axis, and Center.