1. (noun) fourth
following the third position; number four in a countable series
Synonyms: quartern, quarter, one-fourth, twenty-five percent, fourth part, one-quarter
Antonyms: cardinal
2. (noun) one-fourth, fourth, one-quarter, quarter, fourth part, twenty-five percent, quartern
one of four equal parts
Synonyms: fourth, after part, quartern, one-quarter, fourth part, twenty-five percent, one-fourth, stern, quarter, tail, poop
Antonyms: cardinal
3. (adj) fourth
the musical interval between one note and another four notes away from it
Synonyms: quartern, quarter, one-fourth, twenty-five percent, fourth part, one-quarter
Antonyms: cardinal
4. (adverb) fourth, 4th, quaternary
coming next after the third and just before the fifth in position or time or degree or magnitude
Synonyms: quaternary, fourth, quaternate
Antonyms: cardinal
5. (adverb) fourthly, fourth
in the fourth place
Synonyms: fourthly, fourth
Antonyms: cardinal
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Synonyms and Antonyms of fourth 
