Princeton's WordNet

1. fourth(noun)

   following the third position; number four in a countable series

2. one-fourth, fourth, one-quarter, quarter, fourth part, twenty-five percent, quartern(noun)

   one of four equal parts

   "a quarter of a pound"

3. fourth(adj)

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

4. fourth, 4th, quaternary(adverb)

   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"

5. fourthly, fourth(adverb)

   in the fourth place

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

Kernerman English Learner's Dictionary

1. fourthɔrθ, foʊrθ

   in the number 4 position

   I was the fourth person to speak.

2. fourthɔrθ, foʊrθ

   one of four equal parts; = quarter

   a/one fourth of the population

Wiktionary

1. fourth(Noun)

   The person or thing in the fourth position.

2. fourth(Noun)

   A quarter, one of four equal parts of a whole.

3. fourth(Noun)

   The fourth gear of an engine.

4. fourth(Noun)

   A musical interval which spans four degrees of the diatonic scale, for example C to F (C D E F).

5. fourth(Adjective)

   The ordinal form of the number four.

6. Fourth(Noun)

   The Fourth of July.

Webster Dictionary

1. Fourth(adj)

   next in order after the third; the ordinal of four

2. Fourth(adj)

   forming one of four equal parts into which anything may be divided

3. Fourth(noun)

   one of four equal parts into which one whole may be divided; the quotient of a unit divided by four; one coming next in order after the third

4. Fourth(noun)

   the interval of two tones and a semitone, embracing four diatonic degrees of the scale; the subdominant of any key

• kwartAfrikaans
• جُزء من أربَعَه ، رُبْعArabic
• една от четири еднакви частиBulgarian
• quartoPortuguese (BR)
• čtvrtinaCzech
• das ViertelGerman
• fjerdedelDanish
• ένα τέταρτοGreek
• cuartoSpanish
• neljandikEstonian
• یک چهارمFarsi
• neljäsFinnish
• quatrièmeFrench
• רֶבָעHebrew
• चौथाHindi
• četvrtinaCroatian
• negyedHungarian
• seperempatIndonesian
• fjórði hlutiIcelandic
• quartoItalian
• ４分の１Japanese
• 4분의 1Korean
• ketvirtoji (dalis)Lithuanian
• ceturtā []Latvian
• satu per empatMalay
• vierdeDutch
• fjerdedelNorwegian
• czwarta (część)Polish
• یک چهارمPersian
• څلو رم، څلورمPashto
• quartoPortuguese
• o pă­tri­meRomanian
• четвёртая частьRussian
• štvrtinaSlovak
• četrtinaSlovenian
• četvrtinaSerbian
• fjärdedelSwedish
• 1ใน 4Thai
• dörtte biri, 1/4Turkish
• 四分之一Chinese (Trad.)
• чвертьUkrainian
• چار برابر حصوں میں ایکUrdu
• một phần tưVietnamese
• 四分之一Chinese (Simp.)