Sensation is the activation of the sense organs by a source of physical energy. 

Experience following the stimulation of a sense organ, like the eyes or ears , and a necessary prerequisite to perception is called sensation.

Webster Dictionary Meaning

1. Sensation
- An impression, or the consciousness of an impression, made upon the central nervous organ, through the medium of a sensory or afferent nerve or one of the organs of sense; a feeling, or state of consciousness, whether agreeable or disagreeable, produced either by an external object (stimulus), or by some change in the internal state of the body.
- A purely spiritual or psychical affection; agreeable or disagreeable feelings occasioned by objects that are not corporeal or material.
- A state of excited interest or feeling, or that which causes it.
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