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

 

portent

 noun
noun
BrE BrE//ˈpɔːtent//
 
; NAmE NAmE//ˈpɔːrtent//
 
(literary)
 
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a sign or warning of something that is going to happen in the future, especially when it is something unpleasant synonym omen The event proved to be a portent of the disaster that was to come. We shall try to reach an agreement but the portents are not good. Word Origin late 16th cent.: from Latin portentum ‘omen, token’, from the verb portendere, based on pro- ‘forth’ + tendere ‘stretch’.
See the Oxford Advanced American Dictionary entry: portent