Usage Note
Decimoctavo is the ordinal numeral for 18th, formed from décimo (tenth) + octavo (eighth). In practice, Spanish speakers often replace higher ordinals with cardinal numbers in speech: el piso 18 rather than el piso decimoctavo. Written ordinals use superscript: 18.º (masculine) or 18.ª (feminine).
Examples
"Fue la decimoctava edición del festival."
Natural Translation
It was the eighteenth edition of the festival.

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