(historical) Any day on which business could be legally done, excluding Sundays and public holidays.

(banking, finance) Any type of money that is permitted to be circulated as a medium of exchange as directed by the laws of a nation.

plural of lawful money

The mother of one's spouse. / A mother-in-law apartment. / A mother-in-law sandwich. / (dated) A stepmother.

The husband of one's child.

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.

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.

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