computer, computing device, computing machine, data processor, electronic computer, information processing system - a machine for performing calculations automatically

organisation, organization, arrangement, system - an organized structure for arranging or classifying; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"

hierarchical data structure, hierarchical structure - a structure of data having several levels arranged in a tree-like structure