Definition of socionomic in US English:

socionomic

adjective

  • Relating to environmental or other non-social conditions affecting the formation and development of social groups. Now chiefly in "socionomic sex ratio"noun Zoology. (especially in non-human primates) the ratio of females to males in relatively stable social groups.

Origin

Early 20th century; earliest use found in James M. Baldwin (1861–1934). From socio- + nomic.