1Used to indicate exclusion from a set — "other than / except for X," attached after a noun as "X以外."
土日以外は毎日会社に行っています。
I go to work every day except Saturdays and Sundays.
この店では現金以外の支払い方法も使えます。
This shop also accepts payment methods other than cash.
関係者以外は立ち入り禁止となっております。
Entry is prohibited to anyone other than authorized personnel.
彼女以外に頼れる人がいなかった。
There was no one I could rely on other than her.
2Being outside a defined boundary or scope; referring to something not covered by a set framework.
保証の対象以外の故障は、修理費がかかります。
Repairs for failures outside the scope of the warranty will cost extra.
予想以外の展開に、会場全体が驚いた。
The whole venue was surprised by a development outside anyone's expectations.