Lagrangian point

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La·gran·gi·an point

 (lə-grān′jē-ən)
n.
Astronomy Any of five points in the orbital plane of two bodies, one of which is much larger than the other, at which a third, even smaller body will remain in gravitational equilibrium. Bodies located at Lagrangian points appear stationary with respect to the larger two bodies. Also called Lagrange point.

[After Comte Joseph Louis Lagrange.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Lagrangian point

n
(Astronomy) astronomy one of five points in the plane of revolution of two bodies in orbit around their common centre of gravity, at which a third body of negligible mass can remain in equilibrium with respect to the other two bodies
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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If successful, the two satellites will be positioned at the L2 Langrangian point of the Sun-Earth system, some 1.5 million km from the Earth in the opposite direction to the Sun.
Scientists said the spacecraft was still in its "halo" orbit around the Sun 930,000 miles away, near the so- called "L-1" Langrangian point, where the gravitational pull of the Earth and Sun balances out.