con·gres·sion | \kənˈgreshən\
plural -s

Definition of congression 

: the act or action of coming together (as into assembly, combat, coition) specifically : the coming together of the chromosomes of a dividing cell to form the metaphase plate

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History and Etymology for congression

Latin congression-, congressio, from congressus (past participle of congredi) + -ion-, -io -ion

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