IPA: /ˈfɔːrmərli/
KK: /ˈfɔrmərli/
At a time in the past; previously.
She was formerly a teacher before becoming a writer.
Formerly → It is formed from "former" (from Old French *former*, meaning to shape or form) and "-ly" (meaning in a manner of). The word "formerly" means in a manner relating to a previous time or shape.
Think of something that was 'shaped' ('former') in a certain way 'in the past' ('-ly'). This helps you remember that 'formerly' refers to something that happened before.