Officially
来自Big Physics
Safin(讨论 | 贡献)2022年4月27日 (三) 04:42的版本 (建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=officially+etymology&newwindow=1&hl=en ref] Middle English (originally as a noun): via Ol…”的新页面)
Middle English (originally as a noun): via Old French from Latin officialis, from officium (see office).
wiktionary
From official + -ly.