( Volume ( ( is ( ( the amount ) ( of ( space ( occupied ( by ( ( ( an object ) or ) ( a material ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Volume)) (VP (VBZ is) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN space)) (ADJP (VBN occupied) (PP (IN by) (NP (NP (DT an) (NN object)) (CC or) (NP (DT a) (NN material))))))))) (. .)))
Volume is the amount of space occupied by an object or a material.
(ROOT (S (NP (NN Volume)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space)))))) (SBAR (IN that) (S (NP (NP (DT a) (NN substance)) (CC or) (NP (DT an) (NN object))) (VP (VBZ occupies))))) (. .)))