noun

• The act of assuring; a declaration tending to inspire full confidence; something designed to give confidence.
• The state of being assured; total confidence or trust; a lack of doubt; certainty.
• Firmness of mind; undoubting steadiness; intrepidity; courage; confidence; self-reliance.
• Excessive boldness; impudence; audacity
• (obsolete) Betrothal; affiance.
• (insurance) Insurance; a contract for the payment of a sum on occasion of a certain event, as loss or death. Assurance is used in relation to life contingencies, and insurance in relation to other contingencies. It is called temporary assurance, in the time within which the contingent event must happen is limited.
• (law) Any written or other legal evidence of the conveyance of property; a conveyance; a deed.
• (theology) Subjective certainty of one's salvation.