in astronomy, a point in space at which a small body, under the gravitational influence of two large ones, will remain approximately at rest ... [2 related articles]
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http://www.britannica.com/eb/a-z/l/6
In astronomy, the Lagrangian point is 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.
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One of the solutions to the three-body problem discovered by the eighteenth century French mathematician Lagrange; the two stable Lagrangian points, L-4 and L-5, lie in the orbit of the primary body, leading and trailing it by a 60-degree arc.
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