noun, used as a suffix, noun, adverb
as soon as; just after; immediately after
Attached to the continuative form of a verb or a noun to mean 'right after doing/being ...'. Often used in formal or written contexts.
帰国早々、新しい仕事を始めた。
As soon as I returned to my country, I started a new job.
入社早々、大きなプロジェクトを任された。
Immediately after joining the company, I was put in charge of a big project.
adverb
Used adverbially, often as 早々に, to indicate doing something without delay or earlier than expected.
問題が起きたので、早々に対応した。
Since a problem occurred, we dealt with it promptly.
彼は早々に退社した。
He left the office early.