Definition of "univalent"

(chemistry) Having an atomic valence of 1, or having only one valence.  examples

(medicine) Having a vaccine valence of 1.  examples

(genetics) Of, or relating to, a chromosome that is not paired with its homologous chromosome during synapsis.  examples

(complex analysis, of a (holomorphic) function) (Holomorphic and) injective.  examples

(genetics) Any univalent chromosome.  examples