The wife of one's child.

One's spouse's father. / (dated) A stepfather.

The sister of one's spouse. / The wife of one's sibling. / The wife of the sibling of one's spouse. / The sister of the spouse of one's sibling.

Abbreviation of Indiana, a state of the United States of America.

(biochemistry) Abbreviation of integrase. / internegative; a type of film stock, most commonly used regarding 35mm motion picture negative

The brother of one's spouse. / The husband of one's sibling. / The husband of the sibling of one's spouse. / The brother of the spouse of one's sibling.

Supreme commander of the armed forces of an entire country.

(computing) To gain access to a computer system, usually by providing a previously agreed upon username and password.

Husband or wife of one's cousin. / Cousin of one's husband or wife.

(transitive, intransitive, idiomatic) To help out; lend assistance; contribute; to do one's part to help. / To begin briskly.