Ordinal as adj.: fourth.

In titles of kings and popes: Henry the ~, the ~ Henry, etc.

~ del, ~ part, ~ parti: (a) fourth part, one fourth, a quarter; sethen to ~ del, boil away to one fourth of the original volume; (b) fourth piece or segment; fourth division or section of a book.

(a) at thrid and ~ degre (kne), in the third and the fourth generations from a common ancestor (not including the ancestor as a degree); cousines in thrid and ~ degre, two persons of whom one is the offspring of the other's first cousin; ~ degre of kin, the fourth generation from a common ancestor (counting the ancestor as one degree), a second cousin; mariage in thrid and ~ degre, marriage between a person and the offspring of a first cousin; (b) ~ degre (of heat), the hottest of the four degrees of bodily heat; (c) ~ degre, fourth step in a series, a flight of steps, etc.

In combinations: ~ aǧe, ~ eld, the fourth age of the world [see quots.]; ~ best, fourth in value or excellence; ~ daies fever, a quartan fever; ~ ester dai, fourth day after Easter; ~ finger, ?the index finger, ?the little finger; ~ half yer, half ~ yer, three and one-half years; ~ hour, ~ tide, the fourth hour (of daylight, of the night); ~ prime, fourth morning; half ~ eln, three and one-half ells.

Ordinal as noun: (a) The fourth (person or thing); (b) math. bi fourthes, in groups of four figures.

As adverb: in the fourth place, fourthly.