One of the mysteries of the English language finally explained.
The ninth remove in the chain of kinship; especially the ninth generation of descent from a particular individual. Also (in extended use, especially with to): the greatest possible extent; the maximum degree.
Late Middle English; earliest use found in Henry Lovelich (fl. 1450), poet. From ninth + degree.
ninth degree/ˌnʌɪnθ dɪˈɡriː/
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