( ( Volume ( is ( defined ( as ( ( the amount ) ( of space ) ) ) ) ) ) ( ( an object ) ( ( takes up ) . ) ) )
(ROOT (S (S (NP (NN Volume)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space)))))))) (NP (DT an) (NN object)) (VP (VBZ takes) (PRT (RP up))) (. .)))
Volume is defined as the amount of space an object takes up.
(ROOT (S (NP (DT The) (NN term) (NN volume)) (VP (VBZ means) (SBAR (S (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space) (NN matter)))) (VP (VBZ takes) (PRT (RP up)))))) (. .)))