"beforehand" in the adjective sense
1. advance, beforehand
being ahead of time or need
"gave advance warning"
"was beforehand with her report"
"beforehand" in the adverb sense
1. ahead, in advance, beforehand
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"
Source: WordNet® (An amazing lexical database of English)
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