Another word for formative

An organism was to him something controlled by a formative organizing principle.

When this stage was reached the formative age of feudalism may be considered at an end.

But we may say that the formative age was over when these features of the system had combined to be its characteristic marks.

The formative principle or force of the world is said to contain the several rational germinal forms of things.

While the political element in the development of the Hanseatic League must not be underestimated, it was not so formative as the economic. The foundation was laid for the growth of German towns along the southern shore of the Baltic by the great movement of German colonization of Slavic territory east of the Elbe.