If you are anxious and worried about a future event, then that is an example of having apprehension.
The seizing and detaining of a suspected murderer is an example of apprehension.
Origin of apprehension
- Middle English apprehencioun perception from Old French apprehension from Late Latin apprehēnsiō apprehēnsiōn- from Latin apprehēnsus past participle of apprehendere to seize apprehend
From American Heritage Dictionary of the English Language, 5th Edition