To baptize and formally give a name to a person, especially during a Christian ceremony. The priest christened the infant James during the Sunday service.
To use or experience something for the first time, often marking the occasion in a special way. We christened our new grill with a backyard barbecue.
To ceremonially launch a ship by breaking a bottle of champagne against its bow. The liner was christened with a magnum of champagne before setting sail on her maiden voyage.
To give a name to an object, place, idea, or event, especially at the moment of its creation or introduction. The explorers christened the newly discovered bay 'Hope Harbour'.