<p><strong>Noun</strong></p><ul><li>the act of going back to a previous place or state; return or reversion.</li><li>retrogradation; retrogression.</li><li>(Biology) reversion to an earlier or less advanced state or form or to a common or general type.</li><li>(Psychoanalysis) the reversion to a chronologically earlier or less adapted pattern of behavior and feeling.</li><li>a subsidence of a disease or its manifestations: a regression of symptoms.</li></ul><p><strong>Adjective</strong></p><ul><li>of, relating to, or determined by regression analysis: regression curve; regression equation.</li></ul>