immediately; as soon as possible; as quickly as possible
Expresses urgency; often used when something must be done without delay.
一刻も早く病院に連れて行ってください。
Please take me to the hospital as soon as possible.
一刻も早くこの問題を解決しなければならない。
We must solve this problem immediately.
From 一刻 (one moment) + も (even) + 早く (quickly), literally 'even one moment quickly'.