The prefixes 'Hemi-' and 'semi-' are cognate forms indicating partiality or halves.
Hemi- and semi- are indeed cognate forms. The prefix 'hemi-' implies 'half' or 'part,' while 'semi-' means 'half' or 'part,' often used to express something partial or incomplete. For example, 'hemisphere' refers to half of a sphere, while 'semicircle' denotes half of a circle.
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