Mo /(mō)/

Mo

a., adv., & n.
  1. More; -- usually, more in number. [Obs.]
    An hundred thousand mo.
    Likely to find mo to commend than to imitate it.

Mo
  1. chemical symbol for the element molybdenum. (Chem.)

MO
  1. abbreviation for modus operandi, manner of operating; -- often used to refer to the method an habitual criminal uses to perpetrate his crime.