center of inversion

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center of inversion

[′sen·tər əv in′vər·zhən]
(crystallography)
A point in a crystal lattice such that the lattice is left invariant by an inversion in the point.
(mathematics)
The point O with respect to which an inversion is defined, so that every point P is mapped by the inversion into a point Q that is collinear with O and P.
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