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WordNet-Online
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Adjective fourth has 1 sense
- fourth, 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"
Antonym: cardinal (indirect, via ordinal)
Adverbial fourth has 1 sense
- fourthly, fourth - in the fourth place; "fourthly, you must pay the rent on the first of the month"
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