AD&D Assassinpl. n. assassins; also p.n. Assassin
1. p.n., any member of the Nizari Isma’ilites, an Islamic sect dating from the 11th to the 13th centuries and known for murdering its enemies as a religious duty; from Medieval Latin assassinus, from Arabic hash’shashin, pl. of hash’shash “one who smokes or chews hashish,” c. 1520.
2. n., a person who commits murder; esp. one who murders a politically important person either for hire or from fanatical motives.
3. in D&D, a character class, a subclass of thief, with the ability to kill without resorting to combat.
4. p.n., a live-action game, the precursor of LARPs, created at MIT in the 1970s; following a basic rules set, players attempted to “kill” each other, playing in a large public area (such as a university campus) over a period of hours or days.

Addendum: There was some trouble with the game Assassin in the 70s and early 80s, with universities banning it as a disruptive influence. LARP players always try to make clear that they are NOT playing Assassin.

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