The quality of being extremely impressive, remarkable, or inspiring awe and wonder.
From Old English 'awe' (a feeling of reverential respect mixed with fear) plus the Modern English intensifier 'some' (full of) plus the noun-forming suffix '-ness,' creating a 20th-century casual intensifier.
This word perfectly shows how slang becomes official—'awesomeness' evolved from corporate marketing speak in the 1970s-80s and is now in major dictionaries, showing language follows trends like fashion.
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