does love have a definition?

I think that depends on what type of love you're talking about. A lot of people can claim to "love" someone, but you can tell right away that they're just in it for themselves and really care nothing about the person. Myself, I hold to the Biblical definition of love that you'll find in I Corinthians 13. It's a pretty lengthy description, which can get weighty when read in the KJV but is more manageable in the NASB or the ESV or even the NKJV. I think it's interesting we find so many people who have no idea what it means but claim to "fall in" it, to "be overwhelmed" by it, and so on, but they don't even know where it came from, or what's going on. I don't expect everyone to agree with the definition I hold to, or to believe the Bible, obviously, but an interesting observation nonetheless, that I disagree with you in the fact that you say it has no definition, and it means nothing. I think love has a definition, but people who don't understand it, can't be expected to hold to it perfectly. People will fail in different circumstances, surely, we can see that all the time, but if love is really there I think you'll find that there's a pattern of consistency the rest of the time. I haven't really sat and thought it out a lot, but that's my opinion for what it's worth.