appertain (verb) - to belong to as a function or right; to relate to or be held as part of [ap-er-teyn]
BREAKDOWN: AP- (to) + PER- (thoroughly) + TAIN- (hold)
appurtenant means belonging, pertaining, or supporting
appurtenance is an accessory or accompaniment; something that is complementary or attached that seems fundamental to the whole
See also: tenuous
“Rights are not gifts from one man to another, nor from one class of men to another. It is impossible to discover any origin of rights otherwise than in the origin of man; it consequently follows that rights appertain to man in right of his existence, and must therefore be equal to every man.” —Thomas Paine