Over the years I have found there are two meanings to the word: capturing the actual engagement/asking to be married and the pictures of the couple before the wedding. The first is usually a surprise session set up by the proposer. The latter contains photos of the couple together. Sometimes used for announcements before the wedding or for display at the reception.
If you have signed a contract with me for a wedding, this session will cost you $125.00 per hour. Without a contract, the hourly rate is $150.00.