Definition of "Notch" :

noun: a small cut

noun: a V-shaped or U-shaped indentation carved or scratched into a surface

"There were four notches in the handle of his revolver."

noun: the location in a range of mountains of a geological formation that is lower than the surrounding peaks

noun: a V-shaped indentation

"Mandibular notch."

verb: notch a surface to record something

verb: cut or make a notch into

"Notch the rope."