n.
Pronunciation: ' pa-r ə - ˌ laks
Function: noun
Etymology: Middle French parallaxe, from Greek parallaxis, from parallassein to change, from para- + allassein to change, from allos other
Date: 1580
: the apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object especially : the angular difference in direction of a celestial body as measured from two points on the earth's orbit