1. The condition of preparedness to respond: The alertness of drivers of vehicles is of upmost importance while driving on public roads and freeways.
2. The process of continuous and close attentiveness: Total mental alertness is required in order to pass the final test on Friday.
3. The quality of lively attentiveness: While in the woods early in the morning, Marc was wide awake and full of alertness in. order to listen to and observe the different kinds of birds in the area.