Tranquility
来自Big Physics
Safin（讨论 | 贡献）2022年4月28日 (四) 01:49的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=tranquility+etymology&newwindow=1&hl=en ref] late Middle English: from French tranquille…”的新页面）
late Middle English: from French tranquille or Latin tranquillus .
wiktionary
tranquil + -ity, from Middle English tranquillite, from Old French tranquillite, from Latin tranquilitas.
etymonline
tranquility (n.)
also tranquillity, late 14c., from Old French tranquilite "peace, happiness" (12c.), from Latin tranquillitatem (nominative tranquillitas) "quietness, stillness; serenity," from tranquillus "quiet, calm, still," perhaps from trans- "over" (here perhaps in its intensive sense of "exceedingly") and an adjective from PIE root *kweie- "be quiet," but de Vaan finds this "semantically vague" and phonetically disputable.
