The Collaborative International Dictionary of English v.0.48:

Beforehand \Be*fore"hand`\, adv. [Before + hand.]
   [1913 Webster]
   1. In a state of anticipation ore preoccupation; in advance;
      -- often followed by with.
      [1913 Webster]

            Agricola . . . resolves to be beforehand with the
            danger.                               --Milton.
      [1913 Webster]

            The last cited author has been beforehand with me.
                                                  --Addison.
      [1913 Webster]

   2. By way of preparation, or preliminary; previously;
      aforetime.
      [1913 Webster]

            They may be taught beforehand the skill of speaking.
                                                  --Hooker.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Beforehand \Be*fore"hand`\, a.
   In comfortable circumstances as regards property; forehanded.
   [1913 Webster]

         Rich and much beforehand.                --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

beforehand
    adv 1: 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]
    adj 1: being ahead of time or need; "gave advance warning"; "was
           beforehand with her report" [syn: advance(a),
           beforehand(p)]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "beforehand":
   ahead, ahead of time, anachronistic, ante, antedated, before,
   beforetime, behind time, behindhand, betimes, dated, earlier,
   early, fore, foredated, foresightedly, forward, in advance,
   in anticipation, late, metachronistic, misdated, mistimed,
   out of date, out of season, overdue, parachronistic, past due,
   postdated, precociously, previous, prochronistic, sooner, tardy,
   unpunctual, unseasonable