Half rider and half horse, the centaur is traditionally read as the meeting of instinct and reason. Dream books link it to the question of whether the wild and the wise in you are pulling together or apart.
Does the traditional reading fit your dream, or did it mean something else to you?
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.