English

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

 

then

 adjective
adjective
BrE BrE//ðen//
 
; NAmE NAmE//ðen//
 
 
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[only before noun] used to describe somebody who had a particular title, job, etc. at the time in the past that is being discussed That decision was taken by the then president. Word Origin Old English thænne, thanne, thonne, of Germanic origin; related to Dutch dan and German dann, also to that and the.
See the Oxford Advanced American Dictionary entry: then