The term 'group-based' is a compound word formed from 'group' and 'based'. 'Group' originates from the Old French 'groupe', meaning 'cluster' or 'knot', and 'based' comes from the Old French 'basse', meaning 'foundation'.

'Group' evolved from the Old French 'groupe' and 'based' from 'basse', eventually forming the modern English compound 'group-based'.

Initially, 'group' referred to a cluster or collection, and 'based' referred to a foundation. Together, they evolved to mean something organized by or relating to groups.