1. At a previous time
   - once, at one time, erstwhile [archaic], erst [archaic], sometime [archaic]

Sounds like: formally

• plain stitch
• plain turkey
• plain wanderer
• plain weave
• plain-woven
• plainchant
• plainclothesman
• plainly
• plainness
• Plains Indian
• plains lemon monarda
• plains pocket gopher
• plains pocket mouse
• plains spadefoot
• plains turkey
• plainsman
• plainsong
• plainspoken
• plaint
• plaintiff
• plaintiff in error
• plaintive
• plaintively
• plaintiveness
• plait