A material used to fill gaps, holes, or cracks in surfaces, or in some contexts, a variant spelling of 'filler' in certain English dialects.
From Old English 'fyllan' (to fill), shortened to 'filla' in informal speech and dialect, though 'filler' is the standard spelling in modern English.
While 'filler' is standard, 'filla' survives in regional dialects and casual speech—it's one of those words that shows how informal shortcuts eventually reshape what counts as 'correct' English.
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