Differencing and Diff
(p.pr.&vb.n.) of Difference.
Webster's Revised Unabridged Dictionary
Subtracting previous from current values to obtain a stationary (detrended) time series: P stationary = Pt - Pt-1.
Short version of Euro rate' Diff'erential, which is a Chicago Mercantile Exchange Futures contract that is founded on the interest rate spread between the U. S. Dollar and the British pound, the German mark, or the Japanese yen.