alert
1. [ verb ] warn or arouse to a sense of danger or call to a state of preparedness
Synonyms: alarm
Examples:

"The empty house alarmed him" "We alerted the new neighbors to the high rate of burglaries"

Related terms: warn wake alarm
2. [ adjective ] very attentive or observant
Examples:

"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"

Related terms: unalert argus-eyed argus-eyed perched lidless on_the_alert fly heads-up heads-up awake lively wary
3. [ adjective ] mentally responsive
Examples:

"an alert mind"

Related terms: intelligent
4. [ adjective ] not unconscious; especially having become conscious
Synonyms: awake
Examples:

"the patient is now awake and alert"

Related terms: conscious
5. [ noun ] a warning serves to make you more alert to danger
Synonyms: alerting
Related terms: warning eas alarm
6. [ adjective ] (usually followed by `to') showing acute awareness; mentally perceptive
Synonyms: awake alive
Examples:

"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"

Related terms: aware
7. [ noun ] condition of heightened watchfulness or preparation for action
Synonyms: qui_vive
Examples:

: "bombers were put on alert during the crisis"

Related terms: readiness red_alert air_alert strip_alert alarm
8. [ noun ] an automatic signal (usually a sound) warning of danger
Synonyms: warning_signal alarum alarm
Related terms: signal horn red_flag siren torpedo fire_alarm foghorn tocsin air_alert burglar_alarm alarm
Similar spelling:   alertly
  alerting
  Alred
  Allred
  already