(par′ə·tē) noun
1. Equality, as of condition or rank; like state or degree; equivalent position; equal value.
2. The equivalence in legal weight and quality of the legal tender of one class of money to another.
3. Par (def. 1).
4. Equality between the currency or prices of commodities of two countries or cities.
5. Perfect analogy; close resemblance.
6. U.S. A level for farm prices which gives to the farmer the same purchasing power that he averaged during each year of a chosen base period, originally the five years of farm prosperity prior to World War I.
7. Physics That property of a wave whereby its function is symmetrically unchanged by inversion in a coordinate system (even parity), or changed only in sign (odd parity). See synonyms under ANALOGY, SYMMETRY. [<L paritas equality <pars equal]

(par′ə·tē) noun Med.
Fitness or ability to bear offspring. [<L parere bear + -ITY]