"serration" in the noun sense
1. serration
the condition of being serrated
"the serrations of a city skyline"
2. serration
a row of notches
"the pliers had serrations to improve the grip"
3. serration
a single notch in a row of notches
"one of the serrations was broken off"
Source: WordNet® (An amazing lexical database of English)
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