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Dictionary definition for: Fourth

1. (n) following the third position; number four in a countable series

2. (s) 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"

3. (r) in the fourth place; "fourthly, you must pay the rent on the first of the month"

4. (n) one of four equal parts; "a quarter of a pound"

5. (n) the musical interval between one note and another four notes away from it

WordNet 2.1 Copyright Princeton University. All rights reserved.