Dalam teori sistem dunia, negara semi-pinggiran (terkadang hanya disebut sebagai semi-pinggiran) adalah negara yang terindustrialisasi dan kebanyakan bersistem kapitalis yang berada di posisi antara negara pinggiran dan negara inti. Negara semi-pinggiran memiliki karakteristik organisasional dari negara inti sekaligus negara pinggiran dan biasanya secara geografis berada di antara wilayah inti dan pinggiran serta antara dua wilayah inti yang bersaing atau lebih.^[1] Wilayah semi-pinggiran memainkan peran besar dalam memperantarai kegiatan ekonomi, politik dan sosial yang menghubungkan wilayah inti dan pinggiran.^[1]

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