Definition of nadir noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈneɪdɪə(r)//
; NAmE NAmE//ˈneɪdɪr//
[singular] (formal)
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the worst moment of a particular situation the nadir of his career Company losses reached their nadir in 2009. opposite zenith Word Originlate Middle English (as an astronomical term): via French from Arabic naẓīr (as-samt) ‘opposite (to the zenith)’.
See the Oxford Advanced American Dictionary entry: nadir