Etymology
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filler (n.)

late 15c., "one who fills," agent noun from fill (v.). Meaning "something used to fill" is from 1590s. Specifically of food products by 1901.

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Definitions of filler

filler (n.)
used for filling cracks or holes in a surface;
filler (n.)
100 filler equal 1 forint in Hungary;
filler (n.)
copy to fill space between more important articles in the layout of a magazine or newspaper;
filler (n.)
anything added to fill out a whole;
Synonyms: makeweight
filler (n.)
the tobacco used to form the core of a cigar;
From wordnet.princeton.edu