'in advance' definitions:

Definition of 'in advance'

From: WordNet
adverb
Ahead of time; in anticipation; "when you pay ahead (or in advance) you receive a discount"; "We like to plan ahead"; "should have made reservations beforehand" [syn: ahead, in advance, beforehand]
adjective
Situated ahead or going before; "an advance party"; "at that time the most advanced outpost was still east of the Rockies" [syn: advance(a), advanced(a), in advance(p)]

Synonyms of 'in advance'

From: Moby Thesaurus