christening (Noun) — Giving a Christian name at baptism.
christening (Noun) — The event or act of naming something or someone.
christening (Verb) — Assign a specified (usually proper) name to.
christening (Verb) — Administer baptism to. ex. "The parents had the child christened"
christening (Verb) — Use for the first time. ex. "As the sole faculty member working, I got to christen the new office"