AMPLIATION, in a general sense, denotes the act of enlarging or extending the compass of a thing. On a medal of the emperor Antoninus Pius, we find the title Ampliator Civium given him, on account of his having extended the jus civitatis, or right of citizenship, to many states and people before excluded from that privilege. Indeed, it is generally supposed that this prince made the famous constitution whereby all the subjects of the empire were made citizens of Rome.