#convergence  the occurrence of two or more things coming together
  supertype:  #happening__occurrence__natural_event__naturalevent  an event that happens
  subtype:  #encounter__meeting  a casual or unexpected convergence; "he still remembers their meeting in Paris"; "there was a brief encounter in the hallway"
     subtype:  #conjunction.encounter__alignment  (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac
        subtype:  #inferior_conjunction  (astronomy) the alignment of the Earth and a planet on the same side of the sun
        subtype:  #superior_conjunction  (astronomy) the alignment of the Earth and a planet on the opposite side of the sun

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