An emergency; a state or situation requiring immediate action (used for urgent/危機 situations).
非常時は非常口から速やかに避難してください。
In an emergency, please evacuate quickly through the emergency exit.
地震のときは非常持ち出し袋をすぐに持って避難する。
In an earthquake, grab your emergency kit and evacuate immediately.
台風で非常事態宣言が出された。
A state of emergency was declared because of the typhoon.
Extreme; extraordinary; remarkable — indicating something is beyond the usual degree (used as an adjectival noun or adverbially).
彼の成功は非常な努力の結果だ。
His success is the result of extraordinary effort.
非常な暑さで体調を崩す人が出た。
People fell ill because of the extreme heat.
その判断は非常に慎重であるべきだ。
That decision should be made with great caution.