Secure
mid 16th century (in the sense ‘feeling no apprehension’): from Latin securus, from se- ‘without’ + cura ‘care’.
wiktionary
Borrowed from Latin securus(“of persons, free from care, quiet, easy; in a bad sense, careless, reckless; of things, tranquil, also free from danger, safe, secure”), from se-(“without”) + cura(“care”); see cure. Doublet of sure and the now obsolete or dialectal sicker(“certain, safe”).
etymonline
secure (adj.)
1530s, "without care, dreading no evil," from Latin securus, of persons, "free from care, quiet, easy," also in a bad sense, "careless, reckless;" of things, "tranquil; free from danger, safe," from *se cura, from se "free from" (see secret (n.)) + cura "care" (see cure (n.)).
In English, of places, "free from danger, unexposed," from 1580s. Meaning "firmly fixed" (of material things) is from 1841, on notion of "affording grounds for confidence." Of telephones, "not wiretapped," from 1961. Replaced Middle English siker, from Old English sicor, from the Latin word. Related: Securely.
secure (v.)
c. 1600, "to make safe," from secure (adj.). Meaning "ensure, make certain" is from 1650s; that of "seize and hold" is from 1640s; sense of "get possession" is from 1743. Related: Secured; securing.
