alerta
Also the present indicative third singular of alertar · he/she alerts
feminine noun
· commonalert, warning
"La alerta llegó después del charco."
The alert arrived after the puddle.
adjective
alert, watchful, vigilant
"Los soldados están alerta toda la noche."
The soldiers stay alert all night.
adverb
alertly, watchfully
"El centinela vigila alerta desde la torre."
The sentry watches alertly from the tower.