Wiktionary
n. 1 A ring given to one's fiancé or intended fiancé, signifying a promise to wed, typically a gold band with one or more diamonds or other precious stones. 2 # By extension, any ring that has the appearance of a ring given as a promise to wed.
WordNet
n. a ring given and worn as a sign of betrothal
Wikipedia
An engagement ring is a ring indicating that the person wearing it is engaged to be married, especially in Western cultures. In Western countries, engagement rings are worn mostly by women, and rings can feature diamonds or other gemstones. In some other cultures men and women wear matching rings. In some cultures, engagement rings are also used as wedding rings.
The woman's ring is presented as an engagement gift by a man to his prospective spouse while he proposes marriage or directly after she accepts his marriage proposal. It represents a formal agreement to future marriage.
In Western countries, it is customarily worn on the left hand ring finger, though customs vary across the world.
Before agreeing to marry, a couple may choose to buy and wear pre-engagement rings, also called promise rings. After marrying, the couple may wear both engagement rings and wedding rings, or if they prefer, only the wedding rings. Some brides have their engagement and wedding rings permanently soldered together after marriage.
Engagement Ring is a 1961 pop art painting by Roy Lichtenstein. The work is based on the Winnie Winkle series, but Lichtenstein changed both the graphical description and the narrative accompaniment that he presents in a speech balloon. As with most of his early romance comics works, this consisted of "a boy and a girl connected by romantic dialogue and action".
Usage examples of "engagement ring".
He proposes on one knee and you say yes, then he gives you the engagement ring.
Last night in the dark, she hadn't noticed the engagement ring that Pris was wearing.
He looked and saw that she had slipped her engagement ring off her finger.