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  • mo
    mo
    noun
  • Mo
    Mo
    molybdenum.
  • MO
    MO
    abbreviation
    method of operation.
  • -mo
    -mo
    a suffix occurring in a series of compounds that describe book sizes according to the number of leaves formed by the folding of a single sheet of paper.
  • mo.
    mo.
    abbreviation
    month.
  • Mo.
    Mo.
    abbreviation
    Missouri.
  • m.o.
    m.o.
    abbreviation
    mail order.
  • M.O.
    M.O.
    abbreviation
    mail order.
Synonyms

mo

1 American  
[moh] / moʊ /

noun

Informal.
  1. moment.


Mo 2 American  
Symbol, Chemistry.
  1. molybdenum.


MO 3 American  

abbreviation

  1. method of operation.

  2. Missouri (approved especially for use with zip code).

  3. mode of operation.

  4. modus operandi.


-mo 4 American  
  1. a suffix occurring in a series of compounds that describe book sizes according to the number of leaves formed by the folding of a single sheet of paper.

    sixteenmo.


mo. 5 American  

abbreviation

mos plural
  1. month.

  2. months.


Mo. 6 American  

abbreviation

  1. Missouri.

  2. Monday.


m.o. 7 American  

abbreviation

  1. mail order.

  2. modus operandi.

  3. money order.


M.O. 8 American  

abbreviation

  1. mail order.

  2. manually operated.

  3. Medical Officer.

  4. method of operation.

  5. mode of operation.

  6. modus operandi.

  7. money order.


MO 1 British  

abbreviation

  1. Missouri

  2. Medical Officer

  3. modus operandi

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mo 2 British  
/ məʊ /

noun

  1. short for moment

  2. short for moustache

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

m.o. 3 British  

abbreviation

  1. mail order

  2. money order

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Mo 4 British  

symbol

  1. molybdenum

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Mo. 5 British  

abbreviation

  1. Missouri

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

-mo 6 British  

suffix

  1. (in bookbinding) indicating book size by specifying the number of leaves formed by folding one sheet of paper

    12mo, twelvemo, or duodecimo

    16mo or sixteenmo

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mo 7 British  

abbreviation

  1. Macau

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Usage

What else does MO mean? MO—it's a multifunctional set of letters. MO is commonly used as an abbreviation for modus operandi, meaning “mode of operating or working.” It’s also commonly a postal abbreviation for Missouri. You may not always encounter mo in uppercase letters in informal contexts in digital communication. So, two other widespread, popular uses of mo you may encounter are: Mo, a guy’s name, and mo, a dialectical pronunciation of more. In the U. K. and other English-speaking places around the world, mo is a slang shortening of the word moment. How is MO pronounced?[ em-oh ] or [ moh ]What are some variants of MO?or M. O. or mo' or moWhat are some other words related to MO?

Etymology

Origin of mo1

By shortening

Origin of -mo4

Combining form extracted from duodecimo

Vocabulary lists containing mo

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

It can do all the modes that matter in terms of 4K and slow mo and handles them all super well.

From The Verge Sep. 21, 2021

But it’s the mo hanh, caramelized scallions and scallion-flavored oil, that make this banh mi sing.

From Seattle Times Sep. 3, 2020

Looks like they’re ganging up trying to make an honest man out of me, a lo mo, natural born hustler!

From The New Yorker Dec. 2, 2019

Dec. 18 at 4 p.m. and Dec. 23 at 8:30 p.m. at times cq. mo Miracle Theatre, 535 Eighth St. SE. 202-400-3210. themiracletheatre.com. $6-$8.

From Washington Post Nov. 23, 2016

“It shall be done, Magnificence,” said Reznak mo Reznak.

From "A Dance with Dragons" by George R. R. Martin

“Loudoun was called the breadbasket of the Revolution,” said Denise Mo, executive director of the Loudoun Heritage Farm Museum.

From The Wall Street Journal Jul. 2, 2026

But this turn doesn’t define Mo or his overall arc, which tightly focuses on the constant hustle, creativity and sense of humor required to survive as an immigrant in this country.

From Salon Jul. 1, 2026

Now I don't think Mo Salah can cope with that type of football anymore.

From BBC May 18, 2026

It’s located at the local History Museum on the Square in Springfield, Mo.

From Los Angeles Times May 12, 2026

Mo pointed ahead with the paddle and cried, "Look!"

From "City of the Plague God" by Sarwat Chadda

Altria MO -0.77%decrease; red down pointing triangle reported lower fourth-quarter profit as cigarette shipment volume declined, dragging down its smokeable product business.

From The Wall Street Journal Jan. 29, 2026

Back in April, Walmart announced that it was in the process of removing self-checkouts and returning to regular checkouts in its store in Shrewsbury, MO, a suburb of St. Louis.

From Salon Jul. 17, 2024

But the specific deal with Alonso, a free agent after this season, would be a departure from the Mariners’ typical MO under Jerry Dipoto.

From Seattle Times Jun. 1, 2024

Because doing the most with what’s at hand has always been Soto’s MO: He continuously challenges himself to do more with less.

From Los Angeles Times Oct. 26, 2023

“Oh, big surprise. Maddie’s running away! That’s your MO anytime you come across something you don’t know how to handle.”

From "From Twinkle, with Love" by Sandhya Menon

“It’s key that need for reform is understood, but we don’t need 6 mo. of study,” he wrote.

From New York Times Oct. 22, 2020

Put a baby's clothes over him feet first until he reaches 6 mo. to keep him from growing up stunted.

From Time Magazine Archive

At the age of 18 mo. the prodigy, referred to only as "K," could converse fluently.

From Time Magazine Archive

At Worland, Wyo., lives Doris Johnson, 19 mo., one of many U. S. children crippled by burns.

From Time Magazine Archive

Then wait half a mo. and I'll cut round the corner to Sherrard's and see what I can fish up for you.

From The Youngest Girl in the Fifth A School Story by Davis, Stanley

The elder Iwerks met fellow artist Walt Disney when both men were teenagers working at a Kansas City, Mo., art studio.

From Los Angeles Times Jul. 12, 2026

Dutch visitor Max van Regteren saved by renting a car with his childhood friend instead of paying for flights between Houston and Kansas City, Mo., to attend their matches.

From The Wall Street Journal Jun. 25, 2026

Sheila was raised in Kansas City, Mo., and moved to New York where she worked as a registered nurse but also had a background in theater.

From Los Angeles Times Jun. 23, 2026

He was raised in Kansas City, Mo., and splits time between Los Angeles and the house outside his hometown that he shares with his longtime romantic partner, Katie Crutchfield of the band Waxahatchee.

From The Wall Street Journal May 12, 2026

Elinor retrieved a string of spaghetti from the tablecloth and glanced first at Meggie and then at Mo. She looked cross.

From "Inkheart" by Cornelia Funke

Reacting defines her persona and the cultural m.o. of her memoir.

From Los Angeles Times Sep. 23, 2020

And causing other people’s pain is not in my m.o.

From Salon May 2, 2019

Chanos’s m.o. is to take large short positions in stocks and wait for them to fall to what he considers fair value.

From Slate Jul. 6, 2018

Its m.o., sour beers and Neapolitan-style pizza, continues at the new Fremont location, but there will be an extensive fresh-pasta menu, sandwiches, tacos and a full bar with a biodynamic wine program.

From Seattle Times Dec. 4, 2017

But I think that we have an m.o. now that is pretty much in place and is not so hit and miss any more.

From New York Times Mar. 24, 2014

Fusing couture-level spectacle with crowd-pleasing performance has long been Jacobs’ M.O.

From Salon Mar. 27, 2026

"I feel like in my career I've won on tough golf courses generally, so that's my M.O., I would say," said 2025 Masters runner-up Rose, who led by a shot after an opening-round 62.

From BBC Jan. 31, 2026

Bending Spoons’ M.O. is apparent from even a cursory look at its portfolio and record.

From Slate Jan. 23, 2026

With its slow pacing, shaky handheld cameras, dishwater cinematography and unnervingly extreme closeups, it feels more like an intense indie drama than a whimsical tale of a robber with a peculiar M.O.

From The Wall Street Journal Oct. 9, 2025

The M.O. has had a look at me.

From “Crumps”, The Plain Story of a Canadian Who Went by Keene, Louis

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