An accommodationist is one who compromises his views in order to make them appear more acceptable to others.
There is currently a debate among evolutionists as to whether they should be accommodationist towards religion.  Some prominent evolutionists such as Richard Dawkins are atheists, and aggressively opposed to religion in all its forms. Others such as Francis Collins and Ken Miller attend church and see no contradiction between evolution and their faiths.
Accommodationists such as Eugenie Scott and Chris Mooney are not religious, but argue that evolution is compatible with religion. They believe that the political and legal success of evolutionism depends on not unduly antagonizing religious believers. In particular, their victory in Dover PA depended on convincing the judge that a Catholic like Ken Miller could believe in evolution.