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Adjective: cognisant  kóg-ni-zunt
Usage: Brit (N. Amer: cognizant)
  1. (sometimes followed by 'of') having or showing knowledge or understanding or realization or perception
    "was cognisant of his opponent's hostility";
    - aware, cognizant

See also: alert, alive, awake, awareness, cognisance [Brit], cognizance, conscious, consciousness, knowingness, on the ball, sensible, sensitive, witting