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

To go on a double date.

plural of double date

(transitive) To gauge the age of (an organic material) by comparing the ratio of carbon isotopes.

Alternative spelling of double date

The date on which a pregnant woman is expected to give birth. / The date of payment in financial arrangements. / The date by which a book (or other item) borrowed from a library must be returned.

plural of call date

simple past tense and past participle of double date

The date and year something or someone was born.

plural of date of birth