(rare) The physical act of seizing or taking hold of (something); seizing. / (law) The act of seizing or taking by legal process; arrest.

plural of apprehension

Anticipating something with anxiety, fear, or doubt. / (obsolete) Perceptive; quick to learn; capable of understanding using one's intellect.

Which can be apprehended (usually in the sense of being understood).

the state of being apprehensive

in an apprehensive manner; with apprehension

Such that it can be apprehended; understandably.

The quality of being apprehensible.