the musical interval between one note and another four notes away from it
one of four equal parts; "a quarter of a pound"
following the third position; number four in a countable series
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"
in the fourth place; "fourthly, you must pay the rent on the first of the month"
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