rift
     n 1: a gap between cloud masses; "the sun shone through a rift in
          the clouds"
     2: a narrow fissure in rock
     3: a personal or social separation (as between opposing
        factions); "they hoped to avoid a break in relations"
        [syn: {rupture}, {breach}, {break}, {severance}, {falling
        out}]
Source: WordNet® 2.0