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sentry (plural sentries) 1  A guard, particularly on duty at the entrance to a military base. ( 2 uncountable) Sentry duty; time spent being a sentry. ( 3 nautical) A form of drag to be towed underwater, which on striking bottom is upset and rises to the surface.
Sentience. Sentience is the ability to feel, perceive, or be conscious, or to experience subjectivity. Eighteenth century philosophers used the concept to distinguish the ability to think from the ability to feel.In modern western philosophy, sentience is the ability to experience sensations.For Eastern philosophy, sentience is a metaphysical quality of all things that requires respect and care.ighteenth century philosophers used the concept to distinguish the ability to think from the ability to feel. In modern western philosophy, sentience is the ability to experience sensations. For Eastern philosophy, sentience is a metaphysical quality of all things that requires respect and care.