Heterodoxy includes "any opinions or doctrines at variance with an official or orthodox position". As an adjective, heterodox is used to describe a subject as "characterized by departure from accepted beliefs or standards" (status quo). The noun heterodoxy is synonymous with unorthodoxy, while the adjective heterodox is synonymous with dissident.

Ecclesiastic usage
In the Eastern Orthodox Church, the term is used to refer to Christian churches not belonging to the Eastern Orthodox communion and holding doctrines different from those of Orthodox Christianity, but not as different or thought to be as erroneous as heresy.

Roman Catholicism
The term heterodox is occasionally used by some Christians to refer to themselves when they are in disagreement with orthodox understandings, but voice this disagreement while still maintaining the overall value of the tradition. The heterodox Christian therefore remains in the tradition and attempts to stimulate constructive dialog around issues with which they disagree.

Footnotes

Orthodox
Unorthodox
Heterodox economics
Heterodoxy (magazine)
Nastika