What is the meaning of notch?

noun

• A V-shaped indentation.
  • usage: "mandibular notch"
• The location in a range of mountains of a geological formation that is lower than the surrounding peaks.
  • usage: "we got through the pass before it started to snow"
  • synonyms: pass, mountain pass
• A V-shaped or U-shaped indentation carved or scratched into a surface.
  • usage: "there were four notches in the handle of his revolver"
• A small cut.
  • synonyms: nick, snick

verb

• Cut or make a notch into.
  • usage: "notch the rope"
• Notch a surface to record something. .