noun, noun which may take the genitive case particle 'no'
top-notch; first-rate; excellent
Describes something of the highest quality or degree. Often used in the phrase 一刻みの～ to modify a noun.
He is a top-notch craftsman.
The food at this restaurant is first-rate.
Compound of 一 (ひと, 'one') and 刻み (きざみ, 'notch' or 'step'), literally 'one notch'. The exact historical derivation is uncertain, but it likely originated from the idea of being a cut above the rest.