( ( period ( The time ) ) ( ( elapsed ( during ( ( one ( complete cycle ) ) ( of ( a wave ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN period)) (NP (DT The) (NN time))) (VP (VBN elapsed) (PP (IN during) (NP (NP (CD one) (JJ complete) (NN cycle)) (PP (IN of) (NP (DT a) (NN wave)))))) (. .)))
period The time elapsed during one complete cycle of a wave.
(ROOT (S (NP (NN Period)) (VP (VBZ is) (NP (NP (DT the) (NN time) (NN interval)) (VP (VBN required) (PP (IN for) (NP (CD one) (JJ complete) (NN wave) (S (VP (TO to) (VP (VB pass) (NP (NP (DT a) (NN point)) (VP (VBN called))))))))))) (. .)))