Definition of beforehand adverb from the Oxford Advanced Learner's Dictionary

 

beforehand

 adverb
adverb
BrE BrE//ˈfɔːhænd//
 
; NAmE NAmE//ˈfɔːrhænd//
 
 
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earlier; before something else happens or is done two weeks/three days/a few hours beforehand I wish we'd known about it beforehand. He warned me beforehand what to expect. Word Origin Middle English (originally as two words): from before + hand; probably influenced by Old French avant main.
See the Oxford Advanced American Dictionary entry: beforehand