That which is exhibited to the eye; the appearance which
anything manifests, especially any one among different and varying
appearances of the same object.

Any appearance or aspect of an object of mental apprehension
or view; as, the problem has many phases.

Any one point or portion in a recurring series of changes,
as in the changes of motion of one of the particles constituting a wave
or vibration; one portion of a series of such changes, in distinction
from a contrasted portion, as the portion on one side of a position of
equilibrium, in contrast with that on the opposite side.