What is the meaning of assassins creed

It is about reasearch that is actually happening now into genetic memories. Memories that are stored in DNA. Using the animus Abstergo ( a scientific company allegidly responsible for every scientific breakthrough) to go into the genetic memories of altair a medieval assasin that are stored in Desmond Miles (you). Later in the game it is revealed that the fight between the assasins and the Temlars has continued til the modern day. You are a surviving assasin and abstergo are templars. (spoiler warning) At the end when you kill the assasin master a map is revealed that leads to all the Pieces of Eden. This is what abstergo wanted to find and they would kill you except Lucy persuades them to let you live incase there are any survivors. A sequil is probable on its way.