Present participle of fill, meaning making something full or complete by adding content. Can also refer to a substance used to fill something, like dental fillings or food fillings.
From Old English fyllan, related to German füllen and ultimately from the adjective 'full.' The word has maintained its core meaning across centuries, expanding to include various specialized uses.
The word 'filling' demonstrates how English creates multiple meanings from simple concepts - it's simultaneously an action (filling a cup), a noun (pie filling), and an adjective (filling meal). In dentistry, 'filling' cavities was revolutionized by the invention of dental amalgam in the 1800s, making tooth repair much more effective.
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