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Esperanto: A Complete and Comprehensive Grammar/Adjectives
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Adjectives
In Esperanto, all singular adjectives end in "-a," regardless of gender.
Adjectives agree in number and case with the nouns they modify; thus, all plural adjectives end in "-aj" and accusative plural adjectives end in "-ajn."
Ordinal numerals
Ordinal numbers are the adjective form of a number, and as so, adding the "-a" suffix is sufficient to change the word.
For example:
Esperanto (cardinal)English (cardinal)Esperanto (ordinal)English (ordinal)UnuOneUnuaFirstDuTwoDuaSecondTriThreeTriaThirdKvarFourKvaraFourthKvinFiveKvinaFifthSesSixSesaSixthSepSevenSepaSeventhOkEightOkaEighthNaŭNineNaŭaNinthDekTenDekaTenth