noun, noun or participle which takes 'suru', transitive verb, intransitive verb
complete change; about-face; transformation
Describes a sudden, total change in situation, attitude, appearance, or condition. Often used with する to mean 'change completely' or 'be transformed'.
彼の態度は一変した。
His attitude changed completely.
新
The atmosphere of the company was transformed with the new president's appointment.