A state of watchfulness or readiness; also used as an exclamation meaning 'be alert' or 'watch out.'
Spanish origin, from 'alerta,' possibly derived from Old Italian 'all'erta' (to the height/lookout). The word entered English through trade and military contact with Spanish-speaking regions.
Alerta was popularized by Spanish cavalry—lookouts would shout it when danger approached from high ground, making it one of the oldest military alert systems!
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