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In page Non-governmental organization:

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Similar terms include third-sector organization (TSO), nonprofit organization (NPO), voluntary organization (VO), civil society organization (CSO), grassroots organization (GO), social movement organization (SMO), private voluntary organization (PVO), self-help organization (SHO), and non-state actors (NSAs). Numerous variations exist for the NGO acronym, either due to language, region, or specificity.[citation needed]