The Collaborative International Dictionary of English v.0.48:

Rapprochement \Rap`proche`ment"\, n. [F., fr. rapprocher to
   cause to approach again. See Re-; Approach.]
   Act or fact of coming or being drawn near or together;
   establishment or state of cordial relations.
   [Webster 1913 Suppl.]

         He had witnessed the gradual rapprochement between the
         papacy and Austria.                      --Wilfrid
                                                  Ward.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

rapprochement
    n 1: the reestablishing of cordial relations [syn:
         reconciliation, rapprochement]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "rapprochement":
   accord, accordance, affinity, agape, agreement, amity,
   bonds of harmony, brotherly love, caritas, cement of friendship,
   charity, communion, community, community of interests,
   compatibility, concord, concordance, congeniality, correspondence,
   empathy, esprit, esprit de corps, feeling of identity,
   fellow feeling, fellowship, frictionlessness, good vibes,
   good vibrations, happy family, harmonizing, harmony, identity,
   kinship, like-mindedness, love, making up, mutuality, oneness,
   peace, rapport, reciprocity, reconcilement, reconciliation,
   reunion, settlement, sharing, solidarity, sympathy, symphony,
   team spirit, understanding, union, unison, unity