pre-

late 14c., apprehenden, "grasp with the senses or mind;" early 15c., "grasp, take hold of" physically, from Latin apprehendere "to take hold of, grasp," from ad "to" (see ad-) + prehendere "to seize." This is from prae- "before;" see pre- + -hendere, from PIE root *ghend- "to seize, take."

The metaphoric extension to "seize with the mind" took place in Latin and was the sole sense of cognate Old French aprendre (12c., Modern French appréhender). Often "to hold in opinion but without positive certainty."

We "apprehend" many truths which we do not "comprehend" [Richard Trench, "On the Study of Words," 1856] 

Also compare apprentice). The specific meaning "seize in the name of the law, arrest," is from 1540s. The meaning "be in fear of the future, anticipate with dread" is from c. 1600. Related: Apprehended; apprehending.

late 14c., "perception, comprehension," from Old French apreension "comprehension, something learned" or directly from Latin apprehensionem (nominative apprehensio) "a seizing upon, laying hold of; understanding," noun of action from past-participle stem of apprehendere "take hold of, grasp" physically or mentally, from ad "to" (see ad-) + prehendere "to seize." This is a compound of prae- "before" (see pre-) + -hendere, from PIE root *ghend- "to seize, take."

The sense of "seizure on behalf of authority" is 1570s; that of "anticipation" (usually with dread), "fear of the future" is from c. 1600.