Tenfold; multiplied or repeated ten times.
From Latin 'decem' (ten) + 'plex' (fold, from 'plicare' meaning to fold). Similar to 'duplex' (twofold) or 'multiplex' (many-fold).
The 'plex' root comes from folding—if you fold something once you have two layers (duplex), but fold ten times conceptually and you have 'decemplex,' showing how Latin number words combine with structure words.
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