Simultaneously
来自Big Physics
Safin(讨论 | 贡献)2022年4月27日 (三) 04:20的版本 (建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=simultaneously+etymology&newwindow=1&hl=en ref] mid 17th century: based on Latin simul…”的新页面)
mid 17th century: based on Latin simul ‘at the same time’, probably influenced by late Latin momentaneus .
wiktionary
simultaneous + -ly