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"establishment of cordial relations," 1809, from French rapprochement "reunion, reconciliation," literally "a bringing near," from rapprocher "bring near," from re- "back, again" (see re-) + aprochier (see approach (v.)).
A closer approach of two groups to each other. Rapprochement, a French term, is often applied to two nations, especially ones that become reconciled after relations between them have worsened.