noun
an army; a military force
Refers to a single organized army or military unit, often in historical or strategic contexts.
彼は一軍を率いて敵地に進軍した。
He led an army and advanced into enemy territory.
noun
the whole army; the entire force
Emphasizes the entirety of a military force, not just a part of it.
一軍が総攻撃を開始した。
The whole army launched an all-out attack.
noun
first team; top team; first-string players
Sports term for the primary or varsity squad, as opposed to the second team (二軍).
See also: 二軍
彼は今年から一軍に昇格した。
He was promoted to the first team this year.
noun
the popular group; the cool kids
Colloquial use, often in school settings, referring to the socially dominant or popular clique.
彼女はクラスの一軍グループにいる。
She's in the popular group in class.