The officiant is the one who makes a union official. Dream books read the figure as authority, witness and the voice that confirms a decision you are ready to stand by.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.