The state or quality of being completely full to the brim; overflowing abundance.
From 'brimful' or 'brimfull' (from 'brim' + 'full,' Old English sources) plus the suffix '-ness' (Old English 'nes'). An archaic form emphasizing the doubling of the 'l' in 'full.'
The variant 'brimfull' with double-l shows how English spelling was flexible before standardization—some people doubled the letter for emphasis, like how we might say something is 'super-duper full' today!
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