Meaning of R in English

R

I. ˈär, ˈȧ noun

( plural r's or rs ˈärz, ˈȧz)

Usage: often capitalized, often attributive

1.

a. : the 18th letter of the English alphabet

b. : an instance of this letter printed, written, or otherwise represented

c. : a speech counterpart of orthographic r (as r in run, fry, arid, far-off, Spanish para, rey, French rire, or German rohr )

2. : a printer's type, a stamp, or some other instrument for reproducing the letter r

3. : someone or something arbitrarily or conveniently designated r especially as the 17th or when j is used for the 10th the 18th in order or class

4. : something having the shape of the letter R

5. capitalized : one of the three R's

controversy over the first R

II. abbreviation

Usage: often capitalized

1. rabbi

2. racemic

3. radical

4. radio

5. radius

6. railroad; railway

7. rain

8. range

9. rank

10. rare; rarity

11. ratio

12. real

13. rear

14. Reaumur

15. received

16. recipe

17. reconnaissance

18. recto

19. rector

20. red; reddish

21. refraction

22. refrigerator

23.

[Latin]

regina

24. registered

25. regulating

26. reigned

27. republic; republican

28. reserves

29. reside; residence; resident

30. resistance; resistor

31. respiration

32. respond; response

33.

[French retarder ]

slow

34. retired

35. retree

36. returning

37.

[Latin]

rex

38. rifle

39. right

40. ring

41. riser

42. rises

43. river

44. road

45. rod

46. roentgen

47. roman

48. rood

49. rook

50. rotor

51. rough

52. route

53. royal

54. rubber

55. ruble

56. rule

57. run

58. runic

59. rupee

III. symbol

1. correlation coefficient

2. capitalized gas constant

3. capitalized radical — used especially of a univalent hydrocarbon radical (as alkyl); compare general formula

4. capitalized recipe — often ℞

5. capitalized registered trademark — often enclosed in a circle

6. capitalized Reynolds number

7. capitalized Rydberg constant

8.

a. capitalized a relation in a logical or mathematical proposition

b. a proposition in a logical operation

IV. abbreviation

1. usually capitalized radial

2. repeat

3. rerun

V. symbol

1.

[probably from r ate ]

intrinsic rate of natural increase

2. capitalized the set of all real numbers

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.