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1 [usually in combination] a thing put in a space or container to fill it: these plants are attractive gap-fillers or ground cover
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[mass noun] a substance used for filling cracks or holes in a surface, especially before painting it: wood filler
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[mass noun] material used to fill a cavity or increase bulk: foam filler
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an item serving only to fill space or time in a newspaper, broadcast, or recording.
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a word or sound filling a pause in an utterance or conversation (e.g. er, well, you know).
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a linguistic unit that fills a particular slot in syntactic structure.
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2 [in combination] a person or thing that fills a space or container: supermarket shelf-fillers
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3 [mass noun] US the tobacco blend used in a cigar.