From Middle English siker (“secure, safe, stable, certain; gewiss, securely, safely, certainly”), from Old English sicer, sicor (“secure from, free from guilt and the punishment, safe, free from danger or harm, sure, certain, free from doubt, trustworthy”), from Proto-Germanic *sikuraz (“free, secure”), from Latin sēcūrus (“secure”, literally “without care”). See secure. Cognate with Scots siker, seker (“safe, secure”), North Frisian sijcker (“sure, secure”), Dutch zeker (“sure, certain, safe, secure, confirmed”), German sicher (“sure, secure, confirmed”), Swedish säker (“secure, safe, sure”), Norwegian sikker (“secure”).
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for sicker in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)