Definition of "surety" [sure•ty]

• The condition of being sure, especially of oneself; self-assurance. (noun)
• Something beyond doubt; a certainty. (noun)
• A pledge or formal promise made to secure against loss, damage, or default; a security. (noun)
• One who has contracted to be responsible for another, especially one who assumes responsibilities or debts in the event of default. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Unfortunately the online DoD database does not provide viewers with dates of service, but while absolute surety is not provided here, it is certainly possible that one or both entries listed in that database and the man named in your inquiry actually relate to the same individual."
• "This surety is called the confirmation bias, whereby we seek and find confirmatory evidence in support of already existing beliefs and ignore or reinterpret disconfirmatory evidence."
• "All I can say with 100% surety is that this dish is perfect with idlis and dosas."