Definition of pre- in English:

pre-

Pronunciation: /priː
 
, pri/

prefix

Before (in time, place, order, degree, or importance): pre-adolescent precaution precede

Origin

from Latin prae-.

Definition of pre- in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal