Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unexchangeable is an adjective meaning "not suitable to be exchanged". It carries 2 recorded senses.
not suitable to be exchanged
used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value
Definitions, synonyms and semantic relations for unexchangeable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.