Definition of sociation in US English:

sociation

noun

  • 1An association, a league. Now rare.

  • 2Sociology. Social interaction; socialization.

  • 3Ecology. A basic unit of a mature plant community having one or more dominant species.

Origin

Late 16th century. From post-classical Latin sociatio association, union (3rd cent.) from classical Latin sociāt-, past participial stem of sociāre + -iō. Compare Middle French sociation. In later use in sense 1a only aphetic from association.