Definitions of moiety
(of land or buildings etc) if a person owns a moiety then they own a portion of a particular piece of land or a building etc rather than the entire land or building
As joint owners they each hold a moiety in the property.
(formal; technical) each of two parts into which something is or can be divided
"The demised premises" includes the fixtures fittings, the roof and exterior walls, and a moiety divided medially of all party walls.
a part or portion of something else, especially a smaller part or portion
The FDA will not accept or approve applications from other sponsors to market the active moiety.