WordWeb Online

1. Helpful in bringing about a harmonious adaptation
   "the warden was always accommodative in allowing visitors in";
   - accommodating
    
2. Willing to adjust to differences in order to obtain agreement
   - cooperative
    
3. Tending to reconcile or accommodate; bringing into harmony
   - reconciling

See also: adaptative, adaptive, complaisant, good-natured, helpful, kind, noncompetitive, obliging

Antonym: unaccommodating