1. (Noun): a person who is hired to kill someone for money
2. (Noun): a person who kills someone because they don't like that person
3. (Proper Noun; Fiction(maybe): A member of an ancient order that is at constant war with the Knights Templar, where the largest battles are highlighted by the game series Assassin's Creed.
The first Assassins were Adam and Eve as reveiled in The Truth
Man 1: will you kill this man for me
Woman 1: yes, for $10,000
John Booth, the assassin that killed Abe Lincon
Kid 1: the Assassin's Creed video game is awesome!
Kid 2: ye it is!