【电】 set occurence
gather; troop together; aggregate; assemble; concourse; convene; muster
rendezvous; congregation; concentration
【计】 disjoint set
【医】 aggregate; aggregation; agmen; agmina; convergence
【经】 assembly
happen; generate; occur; take place; engender; exist; go forward; go on
originate
【医】 genesis; occurrence