'Fourth' definitions:

Definition of 'fourth'

From: WordNet
adverb
In the fourth place; "fourthly, you must pay the rent on the first of the month" [syn: fourthly, fourth]
adjective
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: fourth, 4th, quaternary]
noun
Following the third position; number four in a countable series
noun
One of four equal parts; "a quarter of a pound" [syn: one- fourth, fourth, one-quarter, quarter, fourth part, twenty-five percent, quartern]
noun
The musical interval between one note and another four notes away from it

Definition of 'Fourth'

From: GCIDE
  • Fourth \Fourth\, a. [OE. fourthe, ferthe, feorthe, AS. fe['o]r[eth]a, fr. fe['o]wer four.]
  • 1. Next in order after the third; the ordinal of four. [1913 Webster]
  • 2. Forming one of four equal parts into which anything may be divided. [1913 Webster]

Definition of 'Fourth'

From: GCIDE
  • Fourth \Fourth\, n.
  • 1. One of four equal parts into which one whole may be divided; the quotient of a unit divided by four. [1913 Webster]
  • 2. (Mus.) The interval of two tones and a semitone, embracing four diatonic degrees of the scale; the subdominant of any key. [1913 Webster]
  • 3. One coming next in order after the third. [1913 Webster]
  • The Fourth, specifically, in the United States, the fourth day of July, the anniversary of the declaration of American independence; as, to celebrate the Fourth. [1913 Webster]

Synonyms of 'fourth'

From: Moby Thesaurus