unitary

Of or relating to a unit.

Having the nature of a unit; whole.

Based on or characterized by one or more units.

Of or relating to a unit; of the nature of a unit; not divided; entire: specifically noting in chemistry that system in which the molecules of all bodies are compared, as to their magnitude, with one molecule—water, for example—and all chemical reactions are as far as possible reduced to one typical form of reaction, namely double decomposition. Of or pertaining to, or characterized by, unity or uniformity; also, directed at or striving for unity.

In biology, monistic, as distinguished from dualistic.