Definition of equinoctial adjective from the Oxford Advanced American Dictionary

 

equinoctial

 adjective
adjective
NAmE//ˌikwəˈnɑkʃl//
 
, NAmE//ˌɛkwəˈnɑkʃl//
 
 
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connected with an equinox
See the Oxford Advanced Learner's Dictionary entry: equinoctial