Meaning of 急 in Japanese

事態は急を要するので一刻も待てないと彼は言った。
He said that the matter was urgent, and that there was not a moment to lose.

屋根にいく階段は狭くて急でくらいです。
The staircase leading to the rooftop is narrow, steep, and dark.

この川の流れは急だ。
The current of this river is rapid.

でもよー、オラのおとうさんは良い気しねーよ、きっと。
But I don't think Dad would like me to.

これらの建物は応急の修理が必要です。
These buildings need temporary repairs.

いつもお世話になっていますから、一旦緩急あれば、すぐさま馳せ参じます。
You're always there for me, so if you're ever in dire straits, just let me know and I'll come running.

彼女は危急の事態に備えた。
She provided for an urgency.

せかしたくないけど、次のバスに乗ろう。
I don't want to rush you, but let's try to catch the next bus.