a minute or slight vibration or agitation ...1749
from Latin vibratiuncula, diminutive of Latin vibrātio (vibration n.)
FIRST DOCUMENTED USE
1749 - see EXAMPLE below
"...Sensory Vibrations, by being often repeated, beget, ini the medullary Substance of the Brain, a Disposition to diminutive Vibrations, which may also be called Vibratiuncles, and Miniatures, corresponding to themselves respectively..."
From: Observations on Man, His Frame, His Duty, and His Expectations
- David Hartley