Top Definition
In financial derivatives, where the hedge position corresponds one-for-one with the notional of the derivative.

This is always true of forwards and swaps: thus, Jérôme Kerviel, as a swaps trader, was on SocGen's Delta One desk.
The amount of money that Kerviel was making, as a Delta One trader with a 500K risk limit, was suspicious.
by goyische shitheel July 10, 2008
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