following the third position; number four in a countable series

one of four equal parts; a quarter of a pound

[ Syn: one-fourth , one-quarter , quarter , fourth part , twenty-five percent , quartern ]

the musical interval between one note and another four notes away from it

in the fourth place; fourthly, you must pay the rent on the first of the month

[ Syn: fourthly , fourthly , fourthly , fourthly , fourthly , fourthly , fourthly , fourthly ]

coming next after the third and just before the fifth in position or time or degree or magnitude; the quaternary period of geologic time extends from the end of the tertiary period to the present

[ Syn: 4th , quaternary ]