Relating to or characteristic of grandiosity or grandisonance; having a grand, impressive, or imposing quality.
From grandisonant plus -ian (a suffix meaning 'relating to' or 'of the nature of'), this creates an adjective describing things that partake of the quality of sounding grand. The -ian suffix appears in words like Shakespearean and Darwinian.
The -ian suffix is interesting because it's often used to create adjectives from proper names (Shakespearean, Freudian) but also from common words (Edwardian). It comes from Latin and suggests connection or adherence to a quality or person.
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