Many anthropologists use the term to refer to societies organized largely on the basis of kinship, especially corporate descent groups (see clan and lineage).
The term is often loosely used to refer to
Some modern theorists hold that contemporary tribes can only be understood in terms of their relationship to states.
From 241 BC, the Tribal Assembly (comitia tributa) in the Roman Republic was organized in 35 Tribes (4 "Urban Tribes" and 31 "Rural Tribes"). The Latin word as used in the Bible translates Greek phyle "race, tribe, clan". In the historical sense, "tribe", "race" or "clan" can be used interchangeably.
A tribal society is thus characterized as having an intermediate amount of social stratification, more than in a mere band society, but less than in a civilization. As in the case of the Roman Republic, or later the Ashanti Empire, the transition from a tribal society to a confederacy of tribes and finally to a full-fledged urban civilization with central government is a gradual process and lacks any clear definition.
In his 1972 study, The Notion of Tribe, Morton Fried proposed that most contemporary tribes do not have their origin in pre-state tribes, but rather in pre-state bands. Such "secondary" tribes, he suggested, actually came about as modern products of state expansion. Bands comprise small, mobile, and fluid social formations with weak leadership, that do not generate surpluses, pay no taxes and support no standing army. Fried argued that secondary tribes develop in one of two ways. First, states could set them up as means to extend administrative and economic influence in their hinterland, where direct political control costs too much. Fried (1972) provided numerous examples of tribes, the members of which spoke different languages and practised different rituals, or that shared languages and rituals with members of other tribes. Similarly, he provided examples of tribes where people followed different political leaders, or followed the same leaders as members of other tribes. He concluded that tribes in general are characterized by fluid boundaries and heterogeneity, are not parochial, and are dynamic.