pathway

noun

• a way that constitutes or serves as a path.
• a way of achieving a specified result; a course of action:research has indisputably been part of the pathway to progress
• Physiology a route, formed by a chain of nerve cells, along which impulses of a particular kind usually travel.
• (also metabolic pathway) Biochemistry a sequence of chemical reactions undergone by a compound or class of compounds in a living organism.