from The American Heritage® Dictionary of the English Language, 4th Edition
- Earlier; before; prior to: prehistoric.
- Preparatory; preliminary: premedical.
- In advance: prepay.
- Anterior; in front of: preaxial.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Before; used to form words meaning "in front of (in space)".
- Before; used to form words meaning "before (in time)".
from the GNU version of the Collaborative International Dictionary of English
- A prefix denoting priority (of time, place, or rank); ; preëminent eminent before or above others. Pre- is sometimes used intensively, .
from The Century Dictionary and Cyclopedia
- A prefix in words of Latin origin, meaning ‘before,’ in place, time, or rank.
- n. In petrography, in the quantitative system of classification of igneous rocks (see rock), a prefix used to indicate that one factor predominates over another to an extent greater than 5:3: as, prealkalic, precalcic, prefelic, etc.
Middle English, from Old French, from Latin prae-, from prae, before, in front; see per1 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From the Latin preposition prae ("before"). (Wiktionary)