#1
fourth s. [
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"
. wn #2
fourth r. [
fourthly] in the fourth place; "fourthly, you must pay the rent on the first of the month"
. wn #3
fourth n. following the third position; number four in a countable series
. wn #4
fourth n. [
one-fourth, one-quarter, quarter, fourth part, twenty-five percent, quartern] one of four equal parts; "a quarter of a pound"
. wn #5
fourth n. the musical interval between one note and another four notes away from it
. wn