• an automatic signal (usually a sound) warning of danger
• a warning serves to make you more Alert to danger
• condition of heightened watchfulness or preparation for action; "bombers were put on Alert during the crisis"
• warn or arouse to a sense of danger or call to a state of preparedness; "The empty house alarmed him"; "We Alerted the new neighbors to the high rate of burglaries"
• very attentive or observant; "an Alert and responsive baby is a joy"; "caught by a couple of Alert cops"; "Alert enough to spot the opportunity when it came"; "constantly Alert and vigilant, like a sentinel on duty"
• (usually followed by `to'') showing acute awareness; mentally perceptive; "Alert to the problems"; "alive to what is going on"; "awake to the dangers of her situation"; "was now awake to the reality of his predicament"
• not unconscious; especially having become conscious; "the patient is now awake and Alert"
• mentally responsive; "an Alert mind"

'Alert' in other languages