Definitions

1. noun

A person or thing that wakes or causes something to become awake or alert

“The morning sun is a natural wakener for most people.”

2. verb

To cause (someone) to become awake or alert

“The coffee waker the sleepy office worker.”

3. verb

To become awake or alert

“The news waker her up to the current situation.”

4. adjective

Tending to wake or cause someone to become awake or alert

“The waker music helped her wake up early in the morning.”