Present participle of double, meaning to make twice as much or as many, or to increase by 100%. Can also refer to serving two functions simultaneously.
From Old French 'dobler,' derived from Latin 'duplus' meaning 'twofold,' from 'duo' (two) and 'plus' (fold). The mathematical and practical senses developed simultaneously in medieval trade and accounting practices.
The concept of doubling underlies one of mathematics' most powerful phenomena - exponential growth. The famous wheat and chessboard problem, where placing one grain on the first square and doubling each subsequent square, results in over 18 quintillion grains by the 64th square, demonstrating how deceptively powerful doubling can be.
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