The Collaborative International Dictionary of English v.0.48:

Front \Front\ (fr[u^]nt), n. [F. frant forehead, L. frons,
   frontis; perh. akin to E. brow.]
   1. The forehead or brow, the part of the face above the eyes;
      sometimes, also, the whole face.
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            Bless'd with his father's front, his mother's
            tongue.                               --Pope.
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            Grim-visaged war hath smoothed his wrinkled front.
                                                  --Shak.
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            His front yet threatens, and his frowns command.
                                                  --Prior.
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   2. The forehead, countenance, or personal presence, as
      expressive of character or temper, and especially, of
      boldness of disposition, sometimes of impudence; seeming;
      as, a bold front; a hardened front; hence, an attitude and
      demeanor intended to represent one's feelings, even if not
      actually felt; as, to put on a good front.
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            With smiling fronts encountering.     --Shak.
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            The inhabitants showed a bold front.  --Macaulay.
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   3. The part or surface of anything which seems to look out,
      or to be directed forward; the fore or forward part; the
      foremost rank; the van; -- the opposite to back or rear;
      as, the front of a house; the front of an army.
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            Had he his hurts before?
            Ay, on the front.                     --Shak.
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   4. A position directly before the face of a person, or before
      the foremost part of a thing; as, in front of un person,
      of the troops, or of a house.
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   5. The most conspicuous part.
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            The very head and front of my offending. --Shak.
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   6. That which covers the foremost part of the head: a front
      piece of false hair worn by women.
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            Like any plain Miss Smith's, who wears s front.
                                                  --Mrs.
                                                  Browning.
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   7. The beginning. "Summer's front." --Shak.
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   8. (Fort.) All the works along one side of the polygon
      inclosing the site which is fortified.
      [Webster 1913 Suppl.]

   9. (Phon.) The middle of the upper part of the tongue, -- the
      part of the tongue which is more or less raised toward the
      palate in the pronunciation of certain sounds, as the
      vowel i in machine, e in bed, and consonant y in you. See
      Guide to Pronunciation, [sect]10.
      [Webster 1913 Suppl.]

   10. The call boy whose turn it is to answer the call, which
       is often the word "front," used as an exclamation. [Hotel
       Cant]
       [Webster 1913 Suppl.]

   Bastioned front (Mil.), a curtain connerting two half
      bastions.

   Front door, the door in the front wall of a building,
      usually the principal entrance.

   Front of fortification, the works constructed upon any one
      side of a polygon. --Farrow.

   Front of operations, all that part of the field of
      operations in front of the successive positions occupied
      by the army as it moves forward. --Farrow.

   To come to the front, to attain prominence or leadership.
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WordNet (r) 3.0 (2006):

front door
    n 1: exterior door (at the entrance) at the front of a building
         [syn: front door, front entrance]