1. 
[syn: afield, abroad]
2.  in or into a field (especially a field of battle); 
- Example: "the armies were afield, challenging the enemy's advance"
- Example: "unlawful to carry hunting rifles afield until the season opens"
3.  off the subject;  beyond the point at issue; 
- Example: "such digressions can lead us too far afield"
The Collaborative International Dictionary of English v.0.48:
Afield \A*field"\, adv. [Pref. a- + field.]
   1. To, in, or on the field. "We drove afield." --Milton.
      [1913 Webster]
            How jocund did they drive their team afield! --Gray.
      [1913 Webster]
   2. Out of the way; astray.
      [1913 Webster]
            Why should he wander afield at the age of
            fifty-five!                           --Trollope.
      [1913 Webster]
WordNet (r) 3.0 (2006):
afield
    adv 1: far away from home or one's usual surroundings; "looking
           afield for new lands to conquer"- R.A.Hall [syn:
           afield, abroad]
    2: in or into a field (especially a field of battle); "the
       armies were afield, challenging the enemy's advance";
       "unlawful to carry hunting rifles afield until the season
       opens"
    3: off the subject; beyond the point at issue; "such digressions
       can lead us too far afield"