复合形式：
M | m |
a.m.,
am,
A.M.,
AM adv | initialism (antemeridian: in the morning) (正午12时之前) | SCSimplified Chinese 早上，上午，午前，中午之前 zǎo shàng ，shàng wǔ，wǔ qián，zhōng wǔ zhī qián
TCTraditional Chinese 早上，上午 |
| | You have a 9:30 a.m. appointment with the doctor. |
| | This nightclub is open until 3 am. |
BM,
B.M.,
MB n | initialism (degree: Bachelor of Medicine) (首字母缩略语) | SCSimplified Chinese 医学学士学位 |
BM,
B.M.,
BMus n | initialism (degree: Bachelor of Music) (首字母缩略语) | SCSimplified Chinese 音乐学士学位 |
BM,
B.M. n | initialism (British Museum) | SCSimplified Chinese 大英博物馆 |
emf,
EMF,
E.M.F.,
e.m.f. n | initialism (electromagnetic field) | SCSimplified Chinese 电磁场 diàn cí chǎng
TCTraditional Chinese 電磁場 |
emf,
EMF,
E.M.F.,
e.m.f. n | initialism (electromotive force) | SCSimplified Chinese 电动势
TCTraditional Chinese 電動勢 |
H.M.S.,
HMS n | UK, initialism (Her Majesty's Ship) (女王) | SCSimplified Chinese 陛下之舰 |
| 备注: "H.M.S." is used in the name of a naval ship. |
H.M.S.,
HMS n | UK, initialism (His Majesty's Ship) (国王) | SCSimplified Chinese 陛下之舰 |
| 备注: "H.M.S." is used in the name of a naval ship. |
LL.M.,
LLM,
M.L. n | initialism (degree: Master of Law) | SCSimplified Chinese 法学硕士学位 |
LL.M.,
LLM,
M.L. n | initialism (holder of a law degree) | SCSimplified Chinese 法学硕士 |
MA,
M.A. n | initialism (degree: Master of Arts) | SCSimplified Chinese 文学硕士学位 |
| | She received her MA in literature in 1997. |
MA,
M.A. n | initialism (holder of Master of Arts degree) (首字母缩略) | SCSimplified Chinese 文学硕士 wén xué shuò shì
TCTraditional Chinese 文學碩士 |
| | | SCSimplified Chinese 持文学硕士学位者 |
Master of Law,
Master of Laws n | (postgraduate legal degree) | SCSimplified Chinese 法学硕士，法律硕士 |
| | Michael has a Master of Law from McGill University. |
Master of Law,
Master of Laws n | (holder of postgraduate legal degree) | SCSimplified Chinese 法学硕士 |
| | | SCSimplified Chinese 法律硕士 |
MEd,
M.Ed. n | initialism (degree: Master of Education) | SCSimplified Chinese 教育学硕士 |
MO,
M.O.,
mo,
m.o. n | informal, initialism (modus operandi: criminal's methods) | SCSimplified Chinese 犯罪手法 |
| | | SCSimplified Chinese 作案手法 |
MO,
M.O.,
mo,
m.o. n | informal, initialism (modus operandi: style) | SCSimplified Chinese 做法 zuò fǎ
TCTraditional Chinese 做法 |
| | | SCSimplified Chinese 犯罪手法 |
MO,
M.O.,
mo,
m.o. n | initialism (money order) | SCSimplified Chinese 汇票 huì piào |
| | | SCSimplified Chinese 汇款单 |
MO,
M.O.,
mo,
m.o. n | initialism (mail order) | SCSimplified Chinese 邮购 yóu gòu |
| | | SCSimplified Chinese 邮购订单 |
MPH,
M.P.H. n | initialism (Master of Public Health: degree) | SCSimplified Chinese 公共健康硕士学位 |
MPH,
M.P.H. n | initialism (Master of Public Health: degree holder) (学位持有人) | SCSimplified Chinese 公共健康硕士 |
MPhil,
M Phil,
M. Phil. n | abbreviation (degree: Master of Philosophy) (学位) | SCSimplified Chinese 哲学硕士 |
MPhil,
M Phil,
M. Phil. n | abbreviation (holder of Master of Philosophy degree) | SCSimplified Chinese 哲学硕士 |
| | | SCSimplified Chinese 持哲学硕士学位的人 |
MS,
M.S.,
MSc.,
M.Sc. n | initialism (degree: Master of Science) (学位) | SCSimplified Chinese 理学硕士, 科学硕士 |
| | It took me two years to finish my MSc. |
MS,
M.S.,
MSc.,
M.Sc. n | initialism (holder of Master of Science degree) (头衔) | SCSimplified Chinese 理学硕士 lǐ xué shuò shì
TCTraditional Chinese 理學碩士 |
| | John Smith, MSc., will be awarded for his outstanding achievements in biomedical science. |
MVP,
M.V.P. n | (sports: most valuable player) (体育) | SCSimplified Chinese 最有价值选手 |
OHMS,
O.H.M.S. expr | written, initialism (On His/Her Majesty's Service) (书面首字母缩略语) | SCSimplified Chinese 为英王陛下效劳 |
p.m.,
pm,
P.M.,
PM adv | initialism (post meridiem: in the afternoon) | SCSimplified Chinese 下午，午后 xià wǔ，wǔ hòu
TCTraditional Chinese 下午，午後 |
| | I'll pick you up at 4 p.m. |
p.m.,
pm,
P.M.,
PM adv | initialism (post meridiem: in the evening) | SCSimplified Chinese 下午 xià wǔ
TCTraditional Chinese 下午 |
| | I like to be in bed by 9.30 PM. |
this p.m.,
this pm,
this P.M.,
this PM adv | informal (this afternoon) | SCSimplified Chinese 今天下午 jīn tiān xià wǔ |
| | Let's take a walk in the park this p.m. |
this p.m.,
this pm,
this P.M.,
this PM adv | informal (this evening) | SCSimplified Chinese 今天晚上 jīn tiān wǎn shàng |
| | I'll meet you at the bar this p.m. |