n. pl. non·con·form·i·ties 1. a. Refusal or failure to conform to accepted standards, conventions, rules, or laws.
b. An instance of this: a measure aimed at reducing nonconformities to the housing code.
2. often Nonconformity Refusal to accept or conform to the doctrines, usage, or polity of the Church of England.
3. Geology An unconformity in which the underlying strata are composed of igneous or metamorphic rock and the overlying strata are composed of sedimentary rock.