The area or space on the outside of something; the exterior (not inside).
窓の外を見ると、桜が満開だった。
When I looked out the window, the cherry trees were in full bloom.
荷物は外に置いておいても問題ない。
It's fine to leave the luggage outside.
この袋の外に名前を書いてください。
Please write your name on the outside of this bag.
The open air; outdoors (as opposed to indoors).
外でピクニックをするのが好きだ。
I like having picnics outdoors.
今日は外で遊べるほど天気がいい。
The weather is nice enough to play outside today.
寒い日は外に長くいない方がいい。
On cold days it's better not to stay outside for long.
Elsewhere; some other place; outside one's own group (e.g., family, company).
彼はうちの会社の外で働いている友人だ。
He is a friend who works outside our company.
この問題は外の専門家に相談した方がいい。
It's better to consult an outside specialist about this problem.
家の外で待ち合わせをしよう。
Let's meet outside the house.