say it: fawrth
fourth is a noun, adjective and adverb meaning "following the third position; number four in a countable series". It carries 5 recorded senses.
following the third position; number four in a countable series
one of four equal parts
“a quarter of a pound”
the musical interval between one note and another four notes away from it
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for fourth come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.