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Kinship terminology refers to the various systems used in languages to refer to the persons to whom an individual is related through kinship. Different societies classify kinship relations differently and therefore use different systems of kinship terminology - for example some languages distinguish between affinal and consanguine uncles, whereas others have only one word to refer to both a father and his brothers. Kinship terminologies include the terms of address used in different languages or communities for different relatives and the terms of reference used to identify the relationship of these relatives to ego or to each other.
Historical view 
Anthropologist Lewis Henry Morgan (1818–1881) performed the first survey of kinship terminologies in use around the world. Though much of his work is now considered dated, he argued that kinship terminologies reflect different sets of distinctions. For example, most kinship terminologies distinguish between sexes (the difference between a brother and a sister) and between generations (the difference between a child and a parent). Moreover, he argued, kinship terminologies distinguish between relatives by blood and marriage (although recently some anthropologists have argued that many societies define kinship in terms other than blood).
However, Morgan also observed that different languages (and, by extension, societies) organize these distinctions differently. He proposed to describe kin terms and terminologies as either descriptive or classificatory. When a descriptive term is used, it can only represent one type of relationship between two people, while a classificatory term represents one of many different types of relationships. For example, the word brother in English-speaking societies indicates a son of the same parent; thus, English-speaking societies use the word brother as a descriptive term. But a person's male first cousin could be the mother's brother's son, mother's sister's son, father's brother's son, father's sister's son, and so on; English-speaking societies therefore use the word cousin as a classificatory term.
Morgan discovered that a descriptive term in one society can become a classificatory term in another society. For example, in some societies, one would refer to many different people as "mother" (the woman who gave birth to oneself, as well as her sister and husband's sister, and also one's father's sister). Moreover, some societies do not group together relatives which the English-speaking societies classify together. For example, some languages have no one-word equivalent to cousin, because different terms refer to mother's sister's children and to father's sister's children.
Armed with these different terms, Morgan identified six basic patterns of kinship terminologies:
- Hawaiian kinship: the most classificatory; only distinguishes between sex and generation. Thus, siblings and cousins are not distinguished (the same terms are used for both types of relatives).
- Sudanese kinship: the most descriptive; no two types of relatives share the same term. Siblings are distinguished from cousins, and different terms are used for each type of cousin (i.e. father's brother's children, father's sister's children, mother's sister's children and mother's brother's children).
- Eskimo kinship: has both classificatory and descriptive terms; in addition to sex and generation, it also distinguishes between lineal relatives (those related directly by a line of descent) and collateral relatives (those related by blood, but not directly in the line of descent). Lineal relatives have highly descriptive terms; collateral relatives have highly classificatory terms. Thus, siblings are distinguished from cousins, while all types of cousins are grouped together. The system of English-language kinship terms falls into the "Eskimo" type.
- Iroquois kinship: has both classificatory and descriptive terms; in addition to sex and generation, it also distinguishes between siblings of opposite sexes in the parental generation. A genealogical relationship traced through a pair of siblings of the same sex is classed as a blood relationship, but one traced though a pair of siblings of the opposite sex can be considered an in-law relationship. In other words, siblings are grouped together with parallel cousins, while separate terms are used for cross-cousins. Also, one calls one's mother's sister "mother" and one's father's brother "father". However, one refers to one's mother's brother and one's father's sister by separate terms (often the terms for "father-in-law" and "mother-in-law", since cross-cousins can be preferential marriage partners).
- Crow kinship: like Iroquois, but further distinguishes between mother's side and father's side. Relatives on the mother's side of the family have more descriptive terms, and relatives on the father's side have more classificatory terms. Thus, Crow kinship is like Iroquois kinship, with the addition that a number of relatives belonging to one's father's matrilineage are grouped together, ignoring generational differences, so that the same term is used for both one's father's sister and one's father's sister's daughter, etc.
- Omaha kinship: like Iroquois, but further distinguishes between mother's side and father's side. Relatives on the mother's side of the family have more classificatory terms, and relatives on the father's side have more descriptive terms. Thus, Omaha kinship is like Iroquois, with the addition that a number of relatives belonging to one's mother's patrilineage are grouped together, ignoring generational differences, so that the same term is used for both one's mother's brother and one's mother's brother's son, etc.
The basic principles of Crow and Omaha terminologies are symmetrical and opposite, with Crow systems having a matrilineal emphasis and Omaha systems a patrilineal emphasis.
Relative age 
Some languages, such as Bengali, Telugu, Tamil, Sinhalese, Chinese (see Chinese kinship), Japanese, Korean, Cambodian, Vietnamese, Hungarian, Bulgarian and Nepalese add another dimension to some relations: relative age. Rather than one term for "brother", there exist, for example, different words for "older brother" and "younger brother". In Tamil, an older male sibling is referred to as Annan and a younger male sibling as Thambi, whereas older and younger female siblings are called Akka and Thangai respectively.
Identification of alternating generations 
Other languages, such as Chiricahua, use the same terms of address for alternating generations. So a Chiricahua child (male or female) calls their paternal grandmother -ch’iné, and likewise this grandmother will call her son's child -ch’iné. Terms that recognize alternating generations and the prohibition of marriage within one's own set of alternate generation relatives (0, ±2, ±4, ±6, etc.) are common in Australian Aboriginal kinship.
Relative age and identification of alternating generations 
Discovery of Dravidian kinship terminology 
Floyd Lounsbury (1964) discovered a seventh, Dravidian type of terminological system that had been conflated with Iroquois in Morgan’s typology of kin-term systems because both systems distinguish relatives by marriage from relatives by descent, although both are classificatory categories rather than based on biological descent. Kay (1967), Scheffler (1971), and Tjon Sie Fat (1981) gave variant criteria for Dravidian classificatory logic, but the basic idea is that of applying an even/odd distinction to relatives that takes into account the gender of every linking relative for ego’s kin relation to any given person. A MFBD(C), for example, is a mother’s father’s brother’s daughter’s child. If each female link (M,D) is assigned a 0 and each male (F,B) a 1, the number of 1s is either even or odd; in this case, even. In a Dravidian system with a patrilineal modulo-2 counting system, marriage is prohibited with this relative, and a marriageable relative must be modulo-2 odd. There exists also a version of this logic with a matrilineal bias. Discoveries of systems that use modulo-2 logic, as in South Asia, Australia, and many other parts of the world, marked a major advance in the understanding of kinship terminologies that differ from kin relations and terminologies employed by Europeans.
On Dravidian kinship 
The Dravidian kinship system involves selective "cousinhood." One's father's brother's children and one's mother's sister's children are NOT cousins but brothers and sisters "one step removed." They are considered "consanguinous" ("pangali") and marriage with them is strictly forbidden as it is "incestuous." However, one's father's sister's children and one's mother's brother's children are considered cousins and potential mates ("muraicherugu"). Marriages between such cousins are allowed and encouraged. There is a clear distinction between cross cousins who are one's true cousins and parallel cousins who are in fact "siblings". Like Iroquois people, Dravidians refer to their father's sister as "mother-in-law" and their mother's brother as "father-in-law."
Abbreviations for genealogical relationships 
The genealogical terminology used in many genealogical charts describes relatives of the subject in question. Using the abbreviations below, genealogical relationships may be distinguished by single or compound relationships, such as BC for a brother's children, MBD for a mother's brother's daughter, and so forth.
- B = Brother
- C = Child(ren)
- D = Daughter
- F = Father
- GC = Grandchild(ren)
- GP = Grandparent(s)
- P = Parent
- S = Son
- Z = Sister
- W = Wife
- H = Husband
- SP = Spouse
- LA = In-law
- SI = Siblings
- M = Mother
- (m.s.) = male speaking
- (f.s.) = female speaking
See also 
- Dyadic kinship term
- Fictive kinship
- Genealogical numbering systems
- Cognatic kinship
- Irish Kinship
- Murdock, G. P. (1949). Social Structure. New York: Macmillan.
- Kryukov, M. V. (1968). Historical Interpretation of Kinship Terminology. Moscow: Institute of Ethnography, USSR Academy of Sciences.
- Pasternak, B. (1976). Introduction to Kinship and Social Organization. Englewood Cliffs, NJ: Prentice Hall.
- Pasternak, B., Ember, M., & Ember, C. (1997). Sex, Gender, and Kinship: A Cross-Cultural Perspective. Upper Saddle River, NJ: Prentice Hall.
- Kay, P. (1967). "On the multiplicity of cross/parallel distinctions". American Anthropologist 69: 83-85.
- Lounsbury, Floyd G. (1964), "A Formal Account of the Crow- and Omaha-Type Kinship Terminologies", in Ward H. Goodenough (ed.), Explorations in Cultural Anthropology: Essays in Honor of George Peter Murdock, New York: McGraw-Hill, pp. 351–393.
- Saxena, R. T. (2012). A Sociolinguistic Study of Hindi and Telugu Kinship Terminology- Variations in the Number of Kinship Terms across the Languages: Linguistic, Social and Anthropological Perspectives. Germany: LAP Lambert Academic Publishing. 
- Scheffler, H. W. 1971. "Dravidian-Iroquois: The Melanesian evidence", Anthropology in Oceania. Edited by L. R. Hiatt and E. Jayawardena, pp. 231–54. Sydney: Angus and Robertson.
- Tjon Sie Fat, Franklin E. 1981. "More Complex Formulae of Generalized Exchange". Current Anthropology 22(4): 377-399.