Appurtenance
Encyclopedia
Appurtenances is a term for what belongs to and goes with something else, with the appurtenance being less significant than what it belongs to. The word ultimately derives from Latin appertinere, "to appertain".

In a legal context, an appurtenance could for instance refer to a back-yard that goes with the adjoining house. The idea being expressed is that the back-yard "belongs" to the house, which is the more significant of the two. In 1919, the Supreme Court of Minnesota adopted the following definition of an appurtenance: "That which belongs to something else. Something annexed to another thing more worthy." -- Cohen v Whitcomb, (1919 142 Minn 20).

In Gestalt
Gestalt psychology
Gestalt psychology or gestaltism is a theory of mind and brain of the Berlin School; the operational principle of gestalt psychology is that the brain is holistic, parallel, and analog, with self-organizing tendencies...

 theory, appurtenance (or "belongingness") is the relation between two things seen which exert influence on each other. For example, fields of color exert influence on each other. "A field part x is determined in its appearance by its 'appurtenance' to other field parts. The more x belongs to the field part y, the more will its whiteness be determined by the gradient xy, and the less it belongs to the part z, the less will its whiteness depend on the gradient xz."

In lexicology
Lexicology
Lexicology is the part of linguistics which studies words, their nature and meaning, words' elements, relations between words , word groups and the whole lexicon....

, an appurtenance is a modifier that is appended or prepended to another word to coin a new word that expresses "belongingness". In the English language, appurtenances are most commonly found in toponyms and demonym
Demonym
A demonym , also referred to as a gentilic, is a name for a resident of a locality. A demonym is usually – though not always – derived from the name of the locality; thus, the demonym for the people of England is English, and the demonym for the people of Italy is Italian, yet, in english, the one...

s, for example, 'Israeli', 'Bengali' etc. have an -i suffix of appurtenance.
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