different between exclave vs undefined

English

ex- +? (en)clave

exclave (plural exclaves)

A portion of a country's territory not connected to the main part
Alaska and Kaliningrad are both examples of exclaves.
(medicine, rare) A detached part of an organ, as of the pancreas, thyroid, or other gland.

un- +? defined

undefined (not comparable)

Lacking a definition or value.
(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
The result of division by zero is undefined.

(lacking a definition or value): indefinite, undefinable; see also Thesaurus:indistinct or Thesaurus:vague

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