Niece vs. Uncle

A daughter of one’s sibling, brother-in-law, or sister-in-law; either the daughter of one's brother ("fraternal niece"), or of one's sister ("sororal niece").

Example: ‘My niece just celebrated her 15th birthday.’;

A relative, in general; especially, a descendant, whether male or female; a granddaughter or a grandson.

A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law. In modern English, this is the primary meaning.

a daughter of your brother or sister

The brother or brother-in-law of one’s parent.

(euphemistic) A companion to one's (usually unmarried) mother.

(figuratively) A source of advice, encouragement, or help.

A pawnbroker.

An affectionate term for a man of an older generation than oneself, especially a friend of one's parents, by means of fictive kin.

An older male African-American person.

A cry used to indicate surrender.

To address somebody by the term uncle.

To act like, or as, an uncle.

The brother of one's father or mother; also applied to an aunt's husband; - the correlative of aunt in sex, and of nephew and niece in relationship.

A pawnbroker.

An eldery man; - used chiefly as a kindly or familiar appellation, esp. (Southern U. S.) for a worthy old negro; as, "Uncle Remus."

Example: ‘Plain old uncle as he [Socrates] was, with his great ears, - an immense talker.’;

the brother of your father or mother; the husband of your aunt

a source of help and advice and encouragement;

Example: ‘he played uncle to lonely students’;

An uncle is a male relative who is a sibling of a parent or married to a sibling of a parent. Uncles who are related by birth are second-degree relatives.