随ずい一いち

also: ずいいつ

ず

い

ち

Common wordFreq.FrequencyTop 50,000

Meanings

1

noun

Used to single out the top example in a category, often in formal or written contexts. Commonly follows a noun with の, e.g., 日本随一の〜.

こく

随ずい

一いち

の

米こめ

どころ

と

し

て

知し

ら

れ

て

いる

。

This region is known as the number one rice-producing area in the country.

一いち番ばん
一番 is the most common everyday word for 'number one' or 'best'. 随一 is more formal and often used in written language or set phrases like 日本随一.
最さい高こう
最高 means 'the highest' or 'the best' in a broader sense, including subjective praise. 随一 is more objective and comparative, singling out one top entity.

From 随 (following, accompanying) and 一 (one), literally 'the one that follows first', i.e., the foremost. The reading ずいいつ is an irregular variant.