exigence

noun

1. The condition of being in need of immediate assistance: distress, exigency, hot water, trouble. See help/harm/harmless.
2. A condition in which something necessary or desirable is required or wanted: exigency, necessity, need. See necessary/unnecessary.
3. A decisive point: climacteric, crisis, crossroad (used in plural), exigency, head, juncture, pass, turning point, zero hour. See decide/hesitate.
4. Something asked for or needed: demand, exigency (often used in plural), need, want. See necessary/unnecessary, over/under.