Since you asked so nicely, I'll answer you one more time, but that's it;
"The intentional and unjustified taking of another humans life." Was the definition since it was first discovered in cuneiform (not in English, obviously, but whoever wrote it made sure to distinguish you needed intent, a lack of justification, and the victim had to be human. Whereas killing was just ending a life for whatever reason.) with the exception of Islamic states and some midevil Lordships who beat the bureaucrats to the punch of trying to - and for the most part succeeding in - changing the definition to exclude their own murders. This was only possible , however do to a low literacy rate with the only ones able to read the real definition being the ones who changed it. Martin Luther -the white monk, not the black civil rights activist - was actually one of the leading causes of the word "murder" being set back to how it originated until roughly 1875, again give or take a decade - so yes, I wouldn't use the current definition because the current definition excludes pretty much all acts of governmental tyranny, like the Holocaust.