This is a sentence
After doping, the conductivity of this semiconductor device is increased manifold.
What's the meaning of "manifold" in this context.
Manifold: Other meanings here
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Manifold is built along the same pattern as threefold, fivefold, and thousandfold, used to describe an increase/decrease of three, five, or a thousand times. In this context, manifold simply means "many times, numerous, multiple."
In online dictionaries llike the one you consulted, you'd almost have to look at the word's etymology [word history, provenance] to figure that out, since the modern usage leans much more toward "various, varied, complicated."