Definition of "MO"

MO

proper noun
1. Abbreviation of Missouri, a state of the United States of America.
2. (stock ticker symbol) Abbreviation of Philip Morris Companies (now Altria Group).
3. (Judaism) Initialism of Modern Orthodox.
noun
countable and uncountable, plural MOs
1. Initialism of modus operandi.
  Quotations
  The Big Man is everywhere. He knows my M.O.!!!!
  1981, James Ellroy, Brown's Requiem, page 207
  This was her apartment, I gathered, and he was living here. That was his MO. He would leech onto some girl and eventually move into her home.
  2022, Ling Ma, “Oranges”, in Bliss Montage, New York: Farrar, Straus and Giroux
2. (banking) Initialism of money order.
3. (military, UK) Initialism of medical officer.
4. (chemistry) Initialism of molecular orbital.
adjective
not comparable
1. (dentistry) Initialism of mesio-occlusal.
2. (computing) Initialism of magnetooptical.