CM

1. C minor
2. Cameroon
3. Candidate Master
4. Captain Mainwaring
5. Center of mass
6. Centimetre 
7. Centimorgan
8. Centre midfielder
9. Certified Manager
10. Certified Midwife
11. Cervical mucus
12. Cetyl myristoleate
13. Chaconia Medal
14. Championship Manager
15. Change management (ITSM)
16. Chemins de Fer du Morbihan
17. Chessmaster
18. Chiari malformation
19. Chief Minister
20. Child Molester
21. China Mobile
22. Chirurgiae Magister 
23. Circular mil
24. CM (school), a youth and community music organisation
25. CM Airlines
26. CM Draconis
27. CM postcode area
28. CM Stair
29. Comercial Mexicana
30. Command Module
31. Common metre
32. Community management
33. Computer Modern
34. Computing
35. Condition monitoring
36. Configuration management
37. Congregation of the Mission
38. Connection Machine
39. Construction management
40. Construction mechanic (United States Navy)
41. Content management
42. Context menu
43. Contingency management
44. Contract manufacturer
45. Contrast medium
46. Contribution margin
47. Cooking Mama
48. Cooler Master
49. Copa Airlines
50. Copley medal
51. Correio da Manhã
52. Coulomb-metre
53. Criminal Minds
54. Crystal Meth, methamphetamine
55. Curium
56. CyanogenMod
57. Cypro-Minoan syllabary
58. The Cross Movement