( ( ( ( wave period ) ( The amount ) ) ( of time ) ) ( ( ( required ( for ( a wave ) ) ) ( to ( ( repeat itself ) ( at ( ( a ( specific point ) ) ( in space ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NN wave) (NN period)) (NP (DT The) (NN amount))) (PP (IN of) (NP (NN time)))) (VP (VBD required) (PP (IN for) (NP (DT a) (NN wave))) (S (VP (TO to) (VP (VB repeat) (NP (PRP itself)) (PP (IN at) (NP (NP (DT a) (JJ specific) (NN point)) (PP (IN in) (NP (NN space))))))))) (. .)))
wave period The amount of time required for a wave to repeat itself at a specific point in space.
(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))))))))))) (. .)))