Charles' law states that the volume of a gas is directly proportional to its temperature, assuming constant pressure.

Say's law is an economic principle that states that supply creates its own demand.

The lawful days are specified in the contract.

Today is a lawful day.

My aunts-in-law are coming to visit next week.

My aunt-in-law is coming to visit us.

Littlewood's law states that a person can expect to experience an event with odds of one in a million (defined by the law as a miracle) about once a month.

He invited his brethren-in-law to the family gathering.

Betteridge's law states that any headline that ends in a question mark can be answered with the word no.

Wolff's law states that bone in a healthy person will adapt to the loads under which it is placed.