AskDefine | Define fourth

Dictionary Definition

fourth adj : 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]


1 following the third position; number four in a countable series
2 one of four equal parts; "a quarter of a pound" [syn: one-fourth, quarter, fourth part, twenty-five percent, quartern]
3 the musical interval between one note and another four notes away from it adv : in the fourth place; "fourthly, you must pay the rent on the first of the month" [syn: fourthly]

User Contributed Dictionary




  1. The ordinal form of the number four.
Previous: third, next: fifth

Usage notes

Abbreviations: 4th, 4th; (in names of monarchs and popes, and formal names in English) IV




  1. (not used in the plural) The person or thing in the fourth position.
  2. A quarter, one of four equal parts of a whole.
  3. (not used in the plural) The fourth gear of an engine.


person or thing in the fourth position
quarter See quarter
fourth gear See fourth gear

Extensive Definition

The word fourth can mean:

Synonyms, Antonyms and Related Words

consecutive intervals, degree, diapason, diatessaron, diatonic interval, diatonic semitone, enharmonic diesis, enharmonic interval, farthing, fifth, fourth part, half step, halftone, interval, less semitone, melodic interval, note, octave, one-fourth, parallel octaves, quart, quarter, quartern, quarto, second, semitone, seventh, sixth, step, third, tone, twenty-five cents, twenty-five percent, two bits, unison interval, whole step
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