1. the process of making something active or operational
2. the state of being made active or put into operation
3. the process by which a biological system becomes active or responsive
Usage: biology; medicine

Examples

• The activation of the alarm system requires a security code.
• Muscle activation occurs when nerve signals reach the muscle fibers.
• The software requires activation within 30 days of installation.
• The activation of the emergency protocol saved many lives.
• Scientists studied the activation of brain cells during sleep.
• Account activation is completed by clicking the email link.
• The activation energy determines how fast a chemical reaction occurs.