A belief in the existence of ghosts or spirits; the practice or philosophy centered on ghosts or ghostly phenomena.
From 'ghost' + '-ism' suffix (meaning belief system or practice). The '-ism' suffix creates nouns for philosophies and ideologies, like 'Buddhism' or 'skepticism.'
Words ending in '-ism' mark belief systems across hundreds of English words—compare 'ghostism' (belief in ghosts) with 'skepticism' (belief in skeptical reasoning), showing how one suffix turns nouns into entire worldviews.
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