formerly
adv. US //ˈfɔɹmɝɫi// UK //fˈɔːməli// for·mer·ly
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1 in the past (adv.) B2 Upper Intermediateat an earlier time, especially when something has changed now.
at a previous time or in a past state; used to contrast a former situation with the current one.
ExampleThis building was formerly a cinema before it became a modern apartment block.
ExampleThe region, formerly a hub for heavy industry, has successfully transitioned into a centre for technological innovation and green energy.
UsageUsually placed before the adjective or noun it modifies, or after the verb 'to be'.
PitfallHe is formerly a teacher.He was formerly a teacher.Because 'formerly' refers to the past, the main verb should usually be in a past tense unless you are identifying a current person by their past title.
From former + -ly.