Synonyms of 'firstly'
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Initially means soon after the beginning of a process or situation, rather than in the middle or at the end of it.
Initially, they were wary of him.
Video: pronunciation of 'firstly'
Thesaurus for firstly from the Collins English Thesaurus
You use firstly in speech or writing when you want to give a reason , make a point, or mention an item that will be followed by others connected with it.