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.

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Definitions of secure from WordNet
secure (v.)
get by special effort;
Synonyms: procure
secure (v.)
cause to be firmly attached;
Synonyms: fasten / fix
secure (v.)
assure payment of;
secure (v.)
make certain of;
Synonyms: guarantee / ensure / insure / assure
secure (v.)
fill or close tightly with or as if with a plug;
Synonyms: plug / stop up
secure (v.)
furnish with battens;
Synonyms: batten / batten down
secure (adj.)
free from fear or doubt; easy in mind;
he was secure that nothing will be held against him
Synonyms: unafraid / untroubled
secure (adj.)
free from danger or risk;
secure from harm
his fortune was secure
made a secure place for himself in his field
secure (adj.)
not likely to fail or give way;
the lock was secure
a secure foundation
a secure hold on her wrist
secure (adj.)
immune to attack; incapable of being tampered with;
a secure telephone connection
Synonyms: impregnable / inviolable / strong / unassailable / unattackable
secure (adj.)
financially safe;
a secure investment
Synonyms: dependable / good / safe