Definition of ninth degree in English:

ninth degree

noun

  • 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.

Origin

Late Middle English; earliest use found in Henry Lovelich (fl. 1450), poet. From ninth + degree.

Pronunciation

ninth degree

/ˌnʌɪnθ dɪˈɡriː/