n That which is prefixed; especially one or more letters or syllables added to the beginning of a word to modify its meaning; as, pre- in prefix, con- in conjure.
v (transitive) To determine beforehand; to set in advance. (defdate|from 15th c.)
v (transitive) To put or fixbefore, or at the beginning of something; to place at the start. (defdate|from 16th c.)