| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
autocatalysis au·to·ca·tal·y·sis (ô'tō-kə-tāl'ĭ-sĭs)
n.
Catalysis of a chemical reaction by one of the products of the reaction.