Definition of parallax noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈpærəlæks//
; NAmE NAmE//ˈpærəlæks//
[uncountable] (specialist)
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the effect by which the position or direction of an object appears to change when the object is seen from different positions Word Originlate 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’).
See the Oxford Advanced American Dictionary entry: parallax