noun, noun which may take the genitive case particle 'no'
the greatest of the day; the best of one's time
A yojijukugo used to describe someone or something as the foremost in their field or era. Often used in formal or literary contexts.
He is acclaimed as the greatest pianist of our time.
This work is the greatest masterpiece of the era.
Similar meaning but less emphatic; 当代随一 is more formal and literary.
Means 'the best' or 'number one', but without the temporal 'of the day' nuance.
A yojijukugo combining 当代 (the present age) and 随一 (the first, the best). The exact historical derivation is uncertain, but the phrase is conventionally used to denote preeminence in a given era.