3 a person or thing that perceives
(C17: from Latin percipiens observing, from percipere to grasp; see perceive)
English Collins Dictionary - English Definition & Thesaurus
alert, alive, astute, aware, bright (informal) discerning, discriminating, intelligent, penetrating, perceptive, perspicacious, quick-witted, sharp, wide-awake
English Collins Dictionary - English synonyms & Thesaurus
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