To have an influence on or effect a change in: Inflation affects the buying power of the dollar. To act on the emotions of; touch or move. To attack or infect, as a disease: Rheumatic fever can affect the heart. Feeling or emotion, especially as manifested by facial expression or body language: "The soldiers seen on television had been carefully chosen for blandness of affect\u201d ( Norman Mailer). Obsolete A disposition, feeling, or tendency. To put on a false show of; simulate: affected a British accent. To have or show a liking for: affects dramatic clothes. Archaic To fancy; love. To tend to by nature; tend to assume: a substance that affects crystalline form. To imitate; copy: "Spenser, in affecting the ancients, writ no language\u201d ( Ben Jonson).