(obsolete) The head of a frankpledge / (obsolete) The constable of a tithing or township

plural of thirdborough

The third child born to a parent or family.

Born as the third child to parent or family. / Third of a particular type to be born to a parent or family.

plural of thirdborn

Pronunciation spelling of thirty. (30)

In the third place; third in a row.

(decision theory) With regard to the Sleeping Beauty problem: one who argues that the probability of heads is 1/3.

plural of thirder

Alternative form of Thirdspace