Pledge
Part of speech: verb
Definition: To make a solemn promise (to do something). To deposit something as a security; to pawn.
Part of speech: noun
Definition: A solemn promise to do something. A person who has taken a pledge of allegiance to a college fraternity, but not yet formally approved. A security to guarantee payment of a debt. A drinking toast. (the pledge): A promise to abstain from drinking alcohol.
Example sentence: Diamonds have an image of purity and light. They are given as a pledge of love and worn as a symbol of commitment.
Assurance
Part of speech: noun
Definition: The act of assuring; a declaration tending to inspire full confidence; that which is designed to give confidence.The state of being assured; firm persuasion; full confidence or trust; freedom from doubt; certainty.Firmness of mind; undoubting, steadiness; intrepidity; courage; confidence; self-reliance.Excess of boldness; impudence; audacity; as, his assurance is intolerable.Betrothal; affiance.Insurance; a contract for the payment of a sum on occasion of a certain event, as loss or death. &hand; Recently, assurance has been used, in England, 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. See Insurance.Any written or other legal evidence of the conveyance of property; a conveyance; a deed. &hand; In England, the legal evidences of the conveyance of property are called the common assurances of the kingdom. Blackstone.
Example sentence: The antiquity and general acceptance of an opinion is not assurance of its truth.