Oral; spoken — not written, performed or communicated by speech.
口頭での説明では分かりにくいので、資料も配布します。
Because an oral explanation is hard to follow, we'll also distribute materials.
口頭試験に合格して面接に進んだ。
He passed the oral exam and proceeded to the interview.
口頭での承認を得たが、文書でも確認してほしい。
We received verbal approval, but I'd like it confirmed in writing as well.