nari-adjective (archaic / formal)
Only when written 大い
Archaic nari-adjective; survives mainly in fixed expressions like 大いなる (great, grand) and 大いに (greatly, very). Not used as a standalone adjective in modern Japanese.
大いなる自然の力に感動した。
I was moved by the great power of nature.
彼は大いに喜んだ。
He was greatly pleased.
prefix
greater (of equal court ranks); upper; senior
Archaic prefix used in the ancient court ranking system to distinguish a higher rank among equals, e.g., 大従 (greater junior rank). Also written as 正. Extremely rare outside historical contexts.
See also: 従 (ひろい)
律令制では、同じ位階の中でも「大」と「少」で上下を区別した。
In the ritsuryō system, even within the same court rank, 'greater' and 'lesser' distinguished higher and lower.