ETYM French alerte, earlier ŕ l'erte on the watch, from Italian all' erta on the watch, prop. (standing) on a height, where one can look around; erta a declivity, steep, erto steep, p. p. of ergere, erigere, to erect, raise, Latin erigere. Related to Erect.
1. Very attentive or observant.
2. Mentally responsive.
3. Not unconscious; especially having become conscious; SYN. awake.
4. (Usually followed by 'to') Showing acute awareness; mentally perceptive; SYN. alive, awake.
1. A warning serves to make one more alert to danger; SYN. alerting.
2. Condition of heightened watchfulness or preparation for action:; SYN. qui vive.
3. An automatic signal (usually a sound) warning of danger