Definitions of alert:

  • noun:   a warning serves to make you more alert to danger
  • noun:   condition of heightened watchfulness or preparation for action
    Example: "Bombers were put on alert during the crisis"
  • noun:   an automatic signal (usually a sound) warning of danger
  • verb:   warn or arouse to a sense of danger or call to a state of preparedness
    Example: "We alerted the new neighbors to the high rate of burglaries"
  • adjective:   mentally responsive
    Example: "An alert mind"
  • adjective:   very attentive or observant
    Example: "An alert and responsive baby is a joy"
  • adjective:   (usually followed by `to') showing acute awareness; mentally perceptive
    Example: "Alert to the problems"
  • adjective:   not unconscious; especially having become conscious
    Example: "The patient is now awake and alert"
  • name:  A surname (very rare: popularity rank in the U.S.: #66111)