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univariant
univariant adj.
Brit. 
/ˌjuːnᵻˈvɛːrɪənt/
, /ˌjuːnᵻˈvɛːrɪənt/U.S. /ˌjunəˈvɛriənt/
Physical Chemistry of a chemical system: having one degree of freedom (cf. freedom n. 12b)./ˌjunəˈvɛriənt/ΘΚΠ
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univariant1899
1899 R. A. Lehfeldt Text-bk. Physical Chem. v. 208 Such systems may conveniently be called invariant, univariant, divariant, &c., according as they possess no, one, two, &c., degrees of freedom.
1940 S. Glasstone Text-bk. Physical Chem. vi. 467 When two phases are in equilibrium..the conditions must correspond to a point on one of the lines..in Fig. 99: only temperature or pressure need be arbitrarily fixed..in order to define the system, and the latter has one degree of freedom, i.e., it is univariant.
1978 P. W. Atkins Physical Chem. vii. 181 The system is univariant when two phases are present; there is only one degree of freedom.
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