/ ˈpærəlæks; NAmE / noun
[ U ] ( technical ) the effect by which the position or direction of an object appears to change when the object is seen from different positions
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WORD ORIGIN
late 16th cent. (also in the general sense fact of seeing wrongly ): from French parallaxe , from Greek parallaxis a change, from parallassein to alternate, based on allassein to exchange (from allos other).