Ten times as much or as many; multiplied by ten.
From Old English 'ten' plus 'fold,' which comes from Old English 'fealdan' (to fold). The concept developed from literally folding something ten times to increase its amount or layers.
The '-fold' suffix literally comes from folding cloth—if you fold something once it's doubled, fold it twice it's quadrupled. Ancient people used this physical action as a metaphor for any multiplication.
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