Sentience means “to be able to perceive or feel things” [1] which is clearly different from being able to suffer or being self-aware.  It is an awareness or ability to perceive, to feel, or to be conscious of events, objects, or sensory patterns. In biological psychology, awareness is defined as perception and cognitive reaction to a condition or event and so it is beyond doubt that animals, plants and even singular-cellular creatures are also sentient since they certainly have the ability to perceive, feel and are aware of events, objects and sensory patterns.   

In the philosophy of consciousness,sentience can refer to the ability of any entity to have subjective perceptual experiences, or as some philosophers refer to them, "qualia" [2].

Find out more about the sentience of plants, cells and other non-living objects