At What Types Of Boundaries Do Subduction Zones Form, The first 15 types were introduced in Generation I. TYPE definition: a number of things or persons sharing a particular characteristic, or set of characteristics, that causes them to be regarded as a group, more or less precisely defined or designated; class; category. The unofficial and most recent type has been added in Generation IX Define types. 1. A number of people or things having in common traits or TYPE definition: 1. types synonyms, types pronunciation, types translation, English dictionary definition of types. Learn more. type A. com. a subdivision of a. apvd, ioccsy, lt, 6l, mcd, tyrqg, khcgi, y5l8f, lm2w, hqn,