Usage Note
Decimotercero is the ordinal for 13th; it can also be written as two words (décimo tercero). Before a masculine singular noun it apocopates to decimotercer (el decimotercer piso), and in everyday speech cardinal numbers often replace it for positions beyond tenth (el piso trece).
Examples
"Vivimos en el decimotercer piso."
Natural Translation
We live on the thirteenth floor.

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