A wavering; unsteadiness.
In medicine, a wave-like motion or undulation of a fluid in a natural or abnormal cavity (e.g. pus in an abscess), which is felt during palpation or percussion.
A motion like that of waves; a moving in this and that direction.
The quality of being unstable.
A state that is not in equilibrium, or in which a small change has a large irreversible effect.