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parallax
noun
par·al·lax
ˈper-ə-ˌlaks
ˈpa-rə-
: 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
Examples of parallax in a Sentence
Recent Examples on the Web
In the past few years these measurements have been replicated by many studies and further refined with the aid of the European Space Agency Gaia parallax observatory to 73 ± 1.
—Marc Kamionkowski, Scientific American, 15 Oct. 2024
To eliminate parallax errors, the minute and second hands are thoughtfully curved at the ends, a feature on all of Hanhart’s watches.
—Bhanu Chopra, Forbes, 4 Sep. 2024
Astronomers use parallax to determine the distance of stars.
—Stefanie Waldek, Travel + Leisure, 7 Apr. 2024
Our brain automatically interprets the discrepancy (or parallax) as depth.
—Stefanie Waldek, Travel + Leisure, 7 Apr. 2024
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Word History
Etymology
Middle French parallaxe, from Greek parallaxis, from parallassein to change, from para- + allassein to change, from allos other
First Known Use
1580, in the meaning defined above
Dictionary Entries Near parallax
Cite this Entry
“Parallax.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/parallax. Accessed 28 Nov. 2024.
Kids Definition
parallax
noun
par·al·lax
ˈpar-ə-ˌlaks
: the apparent shift in position of an object as seen from two different points not on a straight line with the object
Medical Definition
parallax
noun
par·al·lax
ˈpar-ə-ˌlaks
: 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
motion parallax governs the way objects appear to move when the eyes or head are shifted—Edmund Andrews
More from Merriam-Webster on parallax
Britannica.com: Encyclopedia article about parallax
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