- molybdenum.
- method of operation.
- Missouri (approved especially for use with zip code).
- mode of operation.
- modus operandi (def. 2).
- 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.
- month.
- months.
- mail order.
- modus operandi.
- money order.
- Missouri.
- Monday.
- mail order.
- manually operated.
- Medical Officer.
- method of operation.
- mode of operation.
- modus operandi.
- money order.
- mainly British short for moment (def. 1)
- mainly Australian short for moustache (def. 1)
- Macau
- molybdenum
- Missouri
- Medical Officer
- modus operandi
- (in bookbinding) indicating book size by specifying the number of leaves formed by folding one sheet of paper
- mail order
- money order
- Missouri