Definition of forthwith adverb from the Oxford Advanced American Dictionary

 

forthwith

 adverb
adverb
NAmE//ˌfɔrθˈwɪθ//
 
, NAmE//ˌfɔrθˈwɪð//
 
(formal)
 
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immediately; at once The agreement between us is terminated forthwith.
See the Oxford Advanced Learner's Dictionary entry: forthwith