Definition of hendecad in US English:

hendecad

(also endekad, endecad, hendecade)

noun

  • A group, set, or series of eleven things; specifically (especially in Old English) a period of eleven years. Formerly also occasionally: †the number eleven (obsolete).

Origin

Old English; earliest use found in Byrhtferð of Ramsey (fl. c986–c1016), Benedictine monk and scholar. From post-classical Latin hendecad-, hendecas and its etymon ancient Greek ἑνδεκάδ-, ἑνδεκάς the number eleven from ἕνδεκα eleven + -άς.

Pronunciation

hendecad

/ˌhɛnˈdɛkad/