An uncle is usually defined as a male relative who is a sibling of a parent or married to a sibling of a parent, as well as the parent of the cousins. Uncles who are related by birth are second-degree relatives. The female counterpart of an uncle is an aunt, and the reciprocal relationship is that of a nephew or niece. The word comes from Latin: avunculus, the diminutive of avus (grandfather), and is a family relationship within an extended or immediate family. The gender-neutral term pibling, a shortened form of parent's sibling, may refer to either an aunt or an uncle.[1]
In some cultures and families, children may refer to the cousins of their parents as uncle (or aunt). It is also used as a title of respect for older relatives, neighbours, acquaintances, family friends, and even total strangers in some cultures, for example Aboriginal Australian elders. Using the term in this way is a form of fictive kinship.
Any social institution where a special relationship exists between a man and his sisters' children is known as an avunculate (or avunculism or avuncularism).[2] This relationship can be formal or informal, depending on the society. Early anthropological research focused on the association between the avunculate and matrilineal descent, while later research has expanded to consider the avunculate in general society.
Arabic
In Arabic, one's mother's brother is called Khal خال and the mother's sister is called Khalah خالة. On the father's side, one's father's brother is called Amm عم and the father's sister is called Ammah عمّة.
Turkish
In Turkish, one's mother's brother is called dayi, father's brother is amca, and aunt's husband is known as enişte. One's mother's sister is called "teyze". Father's sister is "hala". Uncle's wife is "yenge".
Albanian, Slavic, and Persian
In some cultures, like Albanian, Slavic, or Persian, no single inclusive term describing both a person's kinship to their parental male sibling or parental male in-law exists. Instead, there are specific terms describing a person's kinship to their mother's brother (dajë in Albanian, daiyee in Persian, wuj (diminutive: wujek) in Polish) or a person's kinship to their father's brother (xhajë in Albanian, amou in Persian, stryj (diminutive: stryjek) in Polish). An analogous differentiation exists using separate terms to describe a person's kinship to their mother's female sibling (teze in Albanian, khaleh in Persian, ciotka (diminutive: ciocia) in Polish), and a person's kinship to their father's female sibling, (hallë in Albanian, ammeh in Persian, stryjna (diminutive: stryjenka) in Polish).
Furthermore, in Persian culture the terms used to describe a person's kinship to their maternal or paternal in-laws bear clear and unambiguous descriptions of that relationship, differentiating the parental in-laws from blood-relatives. For example, there is a specific term describing a person's kinship to the spouse of their paternal uncle (i.e. zan-amou, literally 'wife-of-' amou). This clarifies that kinship is to the spouse of the person's paternal male sibling, as opposed to a blood-relationship.
South Asian
In India, unambiguous names are used for various uncles such as one's father's brother chacha (or kaka). If the brother of one's father is older than one's father then he is called Tauji (or taya or bapuji). One's mother's brother is called Mama. A paternal aunt's husband is called Fufa (or Fuva) and a maternal aunt's husband is called Mausa (or Masa) in Hindi (or Gujarati).
Likewise, in neighbouring Bangladesh (and Pakistan), mother's brother is also Mama (or Mamu) as well father's brother as Chacha. A paternal aunt's husband is Phupha and maternal aunt's husband is Khalu.