This article considers the way in which judges play a significant role in developing the meaning of a constitution through the exercise of interpretive choices that have the effect of “informally amending” the text. We demonstrate this by examining four written federal democratic constitutions: those of the United States, the first written federal democratic constitution; India, the federal constitution of the largest democracy on earth; and the constitutions of Canada and Australia, both federal and democratic, but emerging from the English unwritten tradition. We divide our consideration of these constitutions into two ideal types, identified by Bruce Ackerman: the “revolutionary” constitutions of the United States and India, and the “ada...