an act or instance of waking up.
an act or instance of being awakened: I asked the hotel desk for a wake-up at 6.
a time of awaking or being awakened: I'll need a 5 o'clock wake-up to make the early plane.
serving to wake one from sleep: Leave a wake-up call at the front desk.
serving to arouse or alert: a wake-up call on the problems of pollution.
1835–45; noun, adj. use of verb phrase wake up