Having four parts or layers; multiplied or increased by four; occurring in four ways.
Old English 'feowerfeald', compound of 'feower' (four) and 'feald' (fold); the word has been in continuous use for over 1,000 years.
The word 'fourfold' appears in some of the oldest English texts—it's been helping people describe groups of four for over a millennium, making it one of English's most enduring number compounds!
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