( ( A solution ) ( ( is ( ( ( a ( homogenous mixture ) ) ( of ( ( ( two or ) more ) substances ) ) ) ( that ( exist ( in ( a ( single phase ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN solution)) (VP (VBZ is) (NP (NP (DT a) (JJ homogenous) (NN mixture)) (PP (IN of) (NP (QP (CD two) (CC or) (JJR more)) (NNS substances))) (SBAR (WHNP (WDT that)) (S (VP (VBP exist) (PP (IN in) (NP (DT a) (JJ single) (NN phase)))))))) (. .)))
A solution is a homogenous mixture of two or more substances that exist in a single phase.
(ROOT (S (NP (NN Solution)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT a) (JJ homogeneous) (NN mixture)) (PP (IN of) (NP (QP (CD two) (CC or) (JJR more)) (NNS substances))))))) (. .)))
Solution is the term for a homogeneous mixture of two or more substances.