Definition of decalage
: the difference between the angles of incidence of the two wings of a biplane that is positive if the incidence of the upper wing is greater than that of the lower
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Origin and Etymology of decalage
French décalage action of putting out of alignment, displacement, removal of a wedge, from décaler to put out of alignment, shift, remove a wedge from (from dé- de-—from Old French des-—+ caler to wedge, chock, from cale wedge, from German keil, from Old High German kīl) + -age
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