Just now I used both words in the same meaning. But in order to define both words deeply, in Sanskrit we have a word – “Kaivalya”; means, “aloneness”. “Loneliness” is, you want to have somebody to escape from you and your incompletions; that is “loneliness”. Even if you have the other person or not, you will be lonely. “Aloneness” is, you are so complete, so fulfilled, so powerful, you don’t need anybody to complete you, make you powerful, that is “aloneness”, whether you have the other person or not. Whether you have the other person or not, if you are complete with yourself, you are “alone”. Whether you have the other person or not, if you are incomplete with yourself, you are “lonely”. “Lonely” people attract slavery, abusive relationships. “Alone” people attract joyful, completing relationships, where not only they are complete, they complete the other person also.