If you can only advance your argument by using equivocation then your argument is likely not valid. It's obvious that the material we deal with on this site is emotionally charged for many people. Our research efforts, however, are meant to be a pursuit of scientific truth, not a bashing effort towards those with whom you disagree. An unpopular belief isn't an incorrect one. Likewise don't give dictionary definitions for things like murder, moral and other words with contested meanings.
Dictionaries give popular definition.
An argument about a definition is trying to establish what something actually means logically. If someone is just making personal attacks ignore him or her, don't even respond to it. It's not worth it. If someone pointed out a flaw in your logic defend it with logic. If you were wrong admit it and move on.