Synonyms of 'in conclusion'
▷ See conclusion
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You use lastly when you want to make a final point, ask a final question, or mention a final item that is connected with the other ones you have already asked or mentioned.
Lastly, I would like to ask you about your future plans.
Thesaurus for in conclusion from the Collins English Thesaurus
You say ' in conclusion ' to indicate that what you are about to say is the last thing that you want to say.