Part of speech: Adjective
coming next after the third and just before the fifth in position or time or degree or magnitude
Example: the quaternary period of geologic time extends from the end of the tertiary period to the present
Part of speech: Noun
the musical interval between one note and another four notes away from it
Categories: Interval, Musical interval
Fourth part, 4th, Quarter, One-fourth, Fourth
The word "fourth" comes from Proto-Germanic *fedurþô. It started in Proto-West Germanic *feurþō. Then it appeared in Old English fēorþa. Later, people used it in Middle English fourthe. Many other languages have similar words:.
four – A related word in the same word family.
th – A related word in the same word family.
A word passing through this many languages survived because it named something universally important.