Phrases of approximately equal length and corresponding structure. Churchill, speaking about the life of a politician, combines this figure with Pun and Climax: "He is asked to stand, he wants to sit, and he is expected to lie." Bacon's laconic "Never complain, never explain" has served generations of later statesmen. Sometimes the similar elements are built into larger structures:
Your reasons at dinner have been sharp and sententious; pleasant without scurrility, witty without affection, audcacious without impudency, learned without opinion, and strange without heresy. (Love's Labor Lost,V, i)
A narrower definition (e.g., Ad Herrenium, IV.xx) calls for the clauses to have the same number of syllables.