Get origin of unix command
===

Is there a (somewhat) reliable way to get the 'origin' of a command, even if the command is an alias? For example, if I put this in my .bash_profile

    alias lsa="ls -A"

and I wanted to know from the command-line where `lsa` is defined, is that possible? I know about the `which` command, but that doesn't seem to do it. 

Thanks!

