The state of being altered; a change made in the form or nature of a thing; a changed condition.
The act of altering or making different.
A motion like that of waves; a moving in this and that direction.
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.