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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.
In modern Western philosophy, sentience is the ability to experience sensations (known in philosophy of mind as  qualia ). In Eastern philosophy, sentience is a metaphysical quality of all things that requires respect and care.he concept is central to the philosophy of animal rights, because sentience is necessary for the ability to suffer, and thus is held to confer certain rights.