Definition of "Constitutional" :

noun: a regular walk taken as a form of exercise

adjective: sanctioned by or consistent with or operating under the law determining the fundamental political principles of a government

"The constitutional right of free speech."

adjective: constitutional in the structure of something (especially your physical makeup)

adjective: existing as an essential constituent or characteristic

"A constitutional inability to tell the truth."

adjective: of benefit to or intended to benefit your physical makeup

"Constitutional walk."