Period of time previous to the moment in which something is expected to happen.
At an earlier or preceding time than a mentioned event.
situated ahead or going before; "an advance party"; "at that time the most advanced outpost was still east of the Rockies"
ahead of time; in anticipation; "when you pay ahead (or in advance) you receive a discount"; "We like to plan ahead"; "should have made reservatons 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"
