secret
v.
"to keep secret" (described in OED as "obsolete"), 1590s, from secret, n.. Related: Secreted; secreting.
n.
late 14c., from Latin secretus "set apart, withdrawn; hidden, concealed, private," past participle of secernere "to set apart, part, divide; exclude," from se- "without, apart," properly "on one's own" (see se-) + cernere "separate" (see crisis).As an adjective from late 14c., from French secret, adjective use of noun. Open secret is from 1828. Secret agent first recorded 1715; secret service is from 1737; secret weapon is from 1936.
〔李〕[se-=apart 分开；cret=to separate 隔离⇒“being separated apart from the knowledge of others 被隔离开不为他人所知的”→] a. keep from the knowledge or view of others；hidden 秘密的；隐藏的
〔李〕[se-=apart离开；cret=to separate 分隔→“being separated apart from the knowledge of others 被分隔开不为他人所知的”→] I a. concealed秘密的