A feather drifting down is traditionally read as a gentle sign, a moment of calm or a thought arriving softly. Many people link it to comfort and remembrance.
When this appeared in your dream, what were you feeling?
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.