Of or relating to harmony; characterized by harmonious agreement or accord.
From Harmonia or harmony + -ial (adjective suffix, variant of -al). This formation is less common than 'harmonious' and appears mainly in specialized or older philosophical and theological texts.
The suffix '-ial' (as in 'martial,' 'celestial') gives words a more formal, elevated tone, so 'harmonial' sounds more philosophical and grand than the everyday 'harmonious'—perfect for 19th-century spiritualist and transcendentalist writers.
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