The definition of the word is basically someone who chooses not to follow the mainstream opinions or beliefs. It is not a commonly used word.
Noun 1. maverick - someone who exhibits great independence in thought and action rebel recusant, nonconformist - someone who refuses to conform to established standards of conduct
Just done a search in Chambers thesaurus for unconformist and the following results were returned: dissenter, rebel, individualist, dissident, radical, protester, heretic, iconoclast, eccentric, maverick, seceder, Bloody Hell Buffalo I'm going to have to get faster on these searches. Well done.
Can't wait until breakaway comes back and lets us know if any of us came up with the word he/she was looking for!