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[1] #1 n. abstraction, abstract entity a general concept formed by extracting common features from specific examples. wn

[2] #2 n. object, physical object a tangible and visible entity; an entity that can cast a shadow; "it was full of rackets, balls and other objects". wn

[3] #3 n. whole, unit an assemblage of parts that is regarded as a single entity; "how big is that part compared to the whole?"; "the team is a unit". wn

[4] #4 n. congener a whole (a thing or person) of the same kind or category as another; "lard was also used, though its congener, butter, was more frequently employed"; "the American shopkeeper differs from his European congener". wn

[5] #5 n. organism, being a living thing that has (or can develop) the ability to act or function independently. wn