(archaeology) a method of determining the age of rock that depends on the production of helium during the decay of various radioactive isotopes of uranium and thorium.

(law, business) Having the same date.

radiocarbon dating.

(archaeology) A technique used to date bones by measuring the amount of fluorine absorbed from the surrounding soil.

A social outing with a current or potential lover which holds the possibility of a sexual encounter.

A (romantic) date that two couples go on together.

To go on a double date.

An organized event in which prospective romantic partners meet each other through a series of short one-to-one meetings

A business providing a service allowing people to meet each other for romantic outings.

An organized event in which prospective romantic partners engage in a series of one-to-one meetings in a library, based around the topic of favourite books.