Usage Note
Decimotercer is the apocopated masculine form of decimotercero, used before a masculine singular noun: el decimotercer capítulo. The full form decimotercero or decimotercera is used predicatively or before feminine nouns. Both one-word and two-word spellings (décimo tercer) appear in practice, but the single-word form is now standard.
Examples
"Este es el decimotercer aniversario del club."
Natural Translation
This is the thirteenth anniversary of the club.

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