Meaning of PRE- in English

PRE-

pre- /priː/ BrE AmE prefix

[ Language: Old French ; Origin: Latin prae- , from prae 'in front of, before' ]

1 . before someone or something ⇨ ante- :

pre-war (=before a war)

2 . in preparation:

a prearranged signal

Preset the video.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.