Abstract: The purpose of the work is the development of a machine-readable dictionary (ontology) for describing the scope and features of implementing software systems that use elements of crowd computing (information processing systems that include operations performed by people interacting with them via the Internet). Ontology will allow us to apply elements of semantic search to work with scientific and technical information in this relatively new but actively developing field of research, which, ultimately, should help to improve the level of organization of research in it. The ontology is constructed by the "top-down" method on the basis of analysis of the existing conceptualizations in the field of human-machine calculations described in the most frequently cited survey publications indexed in the bibliographic database Scopus. As a result, the ontology CROSS-ODF is formed, which allows describing four main characteristics of applications using the elements of crowd calculations: 1) the features of the problem for which the application was created; 2) the characteristics of the tasks formed by the system to the participants; 3) the contribution properties of the participants; 4) specific mechanisms for attracting participants and processing results. The generated ontology is written in the language OWL 2 and is published in the public domain. The developed ontology can be used in research support systems to simplify the search for crawl computing systems that have certain characteristics and experimental results of using such systems.