#union.happening  the occurrence of a uniting of separate parts; "lightning produced an unusual union of the metals"
  supertype:  happening__occurrence__natural_event__naturalevent  an event that happens
  subtype:  amphimixis  union of sperm and egg in sexual reproduction
  subtype:  merger__fusion__unification  an occurrence that involves the production of a union
  subtype:  combining__combination  an occurrence that results in things being combined
     subtype:  recombination  (genetics) a combination of genes or characters different from what they were in the parents
     subtype:  recombination.combining  (physics) a combination of charges or transfer of electrons in a gas that results in the neutralization of ions; important for ions arising from the passage of high-energy particles
     subtype:  consolidation  combining into a solid mass
     subtype:  mix__mixture  an event that combines things in a mixture; "a gradual mixture of cultures"
        subtype:  concoction  an occurrence of an unusual mixture
        subtype:  blend  an occurrence of thorough mixing
     subtype:  conglobation__conglomeration  an occurrence combining miscellaneous things into a (more or less) rounded mass

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