Definition of equinoctial adjective from the Oxford Advanced Learner's Dictionary

 

equinoctial

 adjective
adjective
BrE BrE//ˌiːkwɪˈnɒkʃl//
 
; NAmE NAmE//ˌiːkwɪˈnɑːkʃl//
 
; BrE BrE//ˌekwɪˈnɒkʃl//
 
; NAmE NAmE//ˌekwɪˈnɑːkʃl//
 
 
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connected with an equinox Word Origin late Middle English (in the sense ‘relating to equal periods of day and night’): via Old French from Latin aequinoctialis, from aequinoctium, from aequi- ‘equal’ + nox, noct- ‘night’.
See the Oxford Advanced American Dictionary entry: equinoctial