fourth is the dictionary form of fourths Definition of fourth
fourth has definitions from the fields of music,mathematics,geology
1
[ adjective ] (geology) coming next after the third and just before the fifth in position or time or degree or magnitude

Synonyms

4th quaternary

Examples

"the quaternary period of geologic time extends from the end of the tertiary period to the present"

2
[ adverb ] in the fourth place

Synonyms

fourthly

Examples

"fourthly, you must pay the rent on the first of the month"

3
[ noun ] following the third position; number four in a countable series
4
[ noun ] (mathematics) one of four equal parts

Examples

"a quarter of a pound"

5
[ noun ] (music) the musical interval between one note and another four notes away from it
*