- 1a level on a scale, often marking quality or achievement The quality of the food here has dropped a notch recently. My spirits lifted a few notches when I heard the news. see also top-notch
- 2a V-shape or a circle cut in an edge or a surface, sometimes used to keep a record of something For each day he spent on the island, he cut a new notch in his stick. She tightened her belt an extra notch.