n. pl. sur·e·ties
1. The condition of being sure, especially of oneself; self-assurance.
2. Something beyond doubt; a certainty.
3. A pledge or formal promise made to secure against loss, damage, or default; a security.
4. One who has contracted to be responsible for another, especially one who assumes responsibilities or debts in the event of another party's default.
[Middle English surte, from Old French, from Latin sēcūritās, from sēcūrus, sure; see SECURE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.