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An Affect

  1. (obsolete) One's mood or inclination; mental state. [14th-17th c.]
  2. (obsolete) A desire, an appetite. [16th-17th c.]
  3. (psychology) A subjective feeling experienced in response to a thought or other stimulus; mood, emotion, especially as demonstrated in external physical signs. [from 19th c.]
Usage notes

Affect and effect can both be used as nouns or verbs, but when used as a noun the word affect is limited to the above psychology uses and the definitions for effect are much more common. See also the usage notes as a verb above.