A partial or incomplete orbital path, especially in astronomy or space mechanics.
From 'demi-' (half) + 'orbit' (from Latin 'orbita' meaning wheel or track). This technical term combines the prefix with astronomical terminology, likely emerging in 20th-century space science contexts.
When satellites de-orbit to come back to Earth, they're not really in a complete demiorbit—they're following a partial elliptical path that intersects Earth's atmosphere at one end, which is why re-entry is so calculatingly dangerous.
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