Originally Posted by MrME
–noun 1. the intellectual identification with or vicarious experiencing of the feelings, thoughts, or attitudes of another.
–noun 1. harmony of or agreement in feeling, as between persons or on the part of one person with respect to another.
2. the harmony of feeling naturally existing between persons of like tastes or opinion or of congenial dispositions.
3. the fact or power of sharing the feelings of another, esp. in sorrow or trouble; fellow feeling, compassion, or commiseration.
Clarification: this post of mine doesn't help wrt the overlap of "feeling other's feelings." I think there are other threads on this topic and I suppose the discussion of the difference should probably move there.