(1):

(n.) 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.

(2):

(n.) A purely spiritual or psychical affection; agreeable or disagreeable feelings occasioned by objects that are not corporeal or material.

(3):

(n.) A state of excited interest or feeling, or that which causes it.