the structure of social relations within a group, usually the relations between its subgroups and institutions.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for social organization
sociol the formation of a stable structure of relations inside a group, which provides a basis for order and patterns relationships for new members
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012