Definition of "pathway"

pathway

/ˈpɑːθˌweɪ/

noun
plural pathways
1. A footpath or other path or track.
  Quotations
  YOU WILL REMEMBER there was no road—not even a pathway—between the castle of the Wicked Witch and the Emerald City.
  1900 May 17, L[yman] Frank Baum, “The Winged Monkeys”, in The Wonderful Wizard of Oz, Chicago, Ill., New York, N.Y.: Geo[rge] M. Hill Co., page 167
2. (biochemistry) A sequence of biochemical compounds, and the reactions linking them, that describe a process in metabolism or catabolism.
3. (figurative) A course of action.