A complete recovery from an illness or injury; healed fully, often implying no recurrence or residual effects.
きちんと治療を受ければ、数週間で完治することもある。
With proper treatment, it can sometimes be completely cured in a few weeks.
彼は手術後、１年で完治した。
He made a full recovery one year after the surgery.
インフルエンザは適切なケアで通常完治する。
Influenza usually resolves completely with proper care.