mechanistic

1. Mechanically determined.
2. Philosophy. Of or relating to the philosophy of mechanism, especially tending to explain phenomena only by reference to physical or biological causes.
3. Automatic and impersonal; mechanical.

1. Mechanically determined.
2. Of or relating to the philosophy of mechanism, especially one that tends to explain phenomena only by reference to physical or biological causes.

The adjective has one meaning:

Meaning #1: explained in terms of physical forces