- a path, course, route, or way.
- a sequence of reactions, usually controlled and catalyzed by enzymes, by which one organic substance is converted to another.
- another word for path (def. 1), path (def. 2)
- a route to or way of access to; way of reaching or achieving something
- courses taken by a student to gain entry to a higher course or towards a final qualification
- a chain of reactions associated with a particular metabolic process
