Definition of forthwith adverb from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌfɔːθˈwɪθ//
; NAmE NAmE//ˌfɔːrθˈwɪθ//
; BrE BrE//ˌfɔːθˈwɪð//
; NAmE NAmE//ˌfɔːrθˈwɪð//
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immediately; at once The agreement between us is terminated forthwith. Word OriginMiddle English (in the sense ‘along with, at the same time’): partly from earlier forthwithal, partly representing forth with used alone without a following noun.
See the Oxford Advanced American Dictionary entry: forthwith