primero
first
adjective pree-MEH-rroh Common
Origin: From Latin primus.
Usage Note
Primero apocopates to primer before a masculine singular noun (el primer día), just like tercero becomes tercer. As an adverb it means 'first of all' (Primero hay que escuchar). The feminine form primera is used in common idioms like de primera ('first-rate').
Examples
"Hoy es el primer día del mes."
Natural Translation
Today is the first day of the month.

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