1. (noun) fourth
following the third position; number four in a countable series
2. (noun) one-fourth, fourth, one-quarter, quarter, fourth part, twenty-five percent, quartern
one of four equal parts
"a quarter of a pound"
3. (adj) fourth
the musical interval between one note and another four notes away from it
4. (adverb) fourth, 4th, quaternary
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. (adverb) fourthly, fourth
in the fourth place
"fourthly, you must pay the rent on the first of the month"
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Definition of 'fourth' 
