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English definition of “afterthought”

afterthought

noun [C usually singular]     /ˈɑːf.tə.θɔːt/ US  /ˈæf.tɚ.θɑːt/
an idea, thought, or plan that was not originally intended but is thought of at a later time: She only asked me to her party as an afterthought. The pillars seem to have been added to the entrance as an afterthought.Ideas, concepts and theories
(Definition of afterthought noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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