nonhierarchical
adjective
non·hi·er·ar·chi·cal
| \ ˌnän-ˌhī-(ə-)ˈrär-ki-kəl also -hir-ˈär-
\
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Definition of nonhierarchical
: not hierarchical
especially
: not divided into, organized by, or involving different levels of importance or status
a nonhierarchical organization/structure All great groups have extraordinary leaders. It's a paradox, really, because great groups tend to be collegial and nonhierarchical, peopled by singularly competent individuals who often have an anti-authoritarian streak. — Warren Bennis and Patricia Ward Biederman