\U"nit*a*ry\, a.
1. Of or pertaining to a unit or units; relating to unity;
   as, the unitary method in arithmetic.
2. Of the nature of a unit; not divided; united.
{Unitary theory} (Chem.), the modern theory that the
   molecules of all complete compounds are units, whose parts
   are bound together in definite structure, with mutual and
   reciprocal influence on each other, and are not mere
   aggregations of more or less complex groups; --
   distinguished from the dualistic theory.