What does apprehension mean?
The definition of apprehension
Ap`pre*hen”sion, n.
Etym: [L. apprehensio: cf. F. appréhension. See Apprehend.]

1 The act of seizing or taking hold of; seizure; as, the hand is an organ of apprehension. Sir T. Browne.
2 The act of seizing or taking by legal process; arrest; as, the felon, after his apprehension, escaped.
3 The act of grasping with the intellect; the contemplation of things, without affirming, denying, or passing any judgment; intellection; perception. Simple apprehension denotes no more than the soul’s naked intellection of an object. Glanvill.
4 Opinion; conception; sentiment; idea.

Note: In this sense, the word often denotes a belief, founded on sufficient evidence to give preponderation to the mind, but insufficient to induce certainty; as, in our apprehension, the facts prove the issue. To false, and to be thought false, is all one in respect of men, who act not according to truth, but apprehension. South.

5 The faculty by which ideas are conceived; understanding; as, a man of dull apprehension.
6 Anticipation, mostly of things unfavorable; distrust or fear at the prospect of future evil. After the death of his nephew Caligula, Claudius was in no small apprehension for his own life. Addison.

— Apprehension, Alarm. Apprehension springs from a sense of danger when somewhat remote, but approaching; alarm arises from danger when announced as near at hand. Apprehension is calmer and more permanent; alarm is more agitating and transient.