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Noun, pl. notches

1. V-shaped cut, indentation, or nick, especially at the edge of an object or structure. (

(Developmental biology)
1. A family of receptors, which upon binding with ligands, plays a major role in neurogenesis, specifically during lateral inhibition (wherein neuroblasts are singled-out from the neuroectoderm) and during binary cell fate specification (wherein ectodermal cells are prevented from differentiating into neuroblasts). (

(Other definitions)
1. A deep close pass; a gap. (

2. A rounded indentation cut into the pages of a book on the edge opposite the spine. (

3. The location in a range of mountains of a geological formation that is lower than the surrounding peaks. (

Word origin: From Middle French oche “notch,” from Old French ochier “to notch,” of unknown origin. Said to be unconnected to nock.


1. Cut or make a notch into. (

2. Notch a surface to record something. (

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