parallax /ˈpaɹəˌlaks/noun 3verb 2forms 3 noun3 •An apparent shift in the position of two stationary objects relative to each other as viewed by an observer, due to a change in observer position.[…] Heliocentrick places, to which the Parallaxes being applied, give the Geocentrick. — 1685 •Any of several methods of determining distance. •The angle of seeing of the astronomical unit. verb2 •To produce an illusion of levels of distance by shifting layers at different rates. •To measure (a distance) based on parallax observations. formsparallaxed · parallaxing · parallaxes