IPA: /ˌæp.rɪˈhɛn.ʃən/
KK: /æprɪˈhɛnʃən/
A feeling of fear or worry about what might happen in the future.
She felt a sense of apprehension before the big exam.
Apprehension is formed from "ad-" (meaning to) and "prehendere" (meaning to seize or grasp). The word describes the act of seizing or grasping something mentally, often referring to a feeling of anxiety or fear about what is to come.
Think of 'seizing' ('prehendere') something 'mentally' ('ad-') — that's why apprehension means a feeling of anxiety or fear about the future.