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We found 75 dictionaries with English definitions that include the word period:
Click on the first link on a line below to go directly to a page where "period" is defined.

General (33 matching dictionaries)

1. period: Wikimedia Commons US English Pronunciations [home, info]
2. period, The period: Dictionary/thesaurus [home, info]
3. period: LookWAYup Translating Dictionary/Thesaurus [home, info]
4. period: WordNet 1.7 Vocabulary Helper [home, info]
5. period: Mnemonic Dictionary [home, info]
6. the period, period: Free Dictionary [home, info]
7. Period: 1911 edition of the Encyclopedia Britannica [home, info]
8. Period (punctuation): American-Britih Dictionary [home, info]
9. period: Webster's 1828 Dictionary [home, info]
10. period: AllWords.com Multi-Lingual Dictionary [home, info]
11. period: Rhymezone [home, info]
12. period: Webster's Revised Unabridged, 1913 Edition [home, info]
13. Period: Online Plain Text English Dictionary [home, info]
14. Period, Period (school), Period (rhetoric), Period (punctuation), Period (physics), Period (periodic table), Period (music), Period (mixtape), Period (mathematics), Period (geology), Period (gene), Period (disambiguation), Period (chemistry), Period (Kontsevich and Zagier), Period (Another American Lie): Wikipedia, the Free Encyclopedia [home, info]
15. period: Cambridge International Dictionary of Idioms [home, info]
16. period: Cambridge Dictionary of American English [home, info]
17. period: UltraLingua English Dictionary [home, info]
18. period: Online Etymology Dictionary [home, info]
19. period, The period: Dictionary.com [home, info]
20. period: Infoplease Dictionary [home, info]
21. period: The Wordsmyth English Dictionary-Thesaurus [home, info]
22. period: Webster's New World College Dictionary, 4th Ed. [home, info]
23. period: Wiktionary [home, info]
24. period: Cambridge Advanced Learner's Dictionary [home, info]
25. the period, period, Period: Wordnik [home, info]
26. period, period: Macmillan Dictionary [home, info]
27. period: Vocabulary.com [home, info]
28. period: Collins English Dictionary [home, info]
29. period: American Heritage Dictionary of the English Language [home, info]
30. period: Oxford Dictionaries [home, info]
31. period: Merriam-Webster.com [home, info]

Art (5 matching dictionaries)

32. period: ODLIS: Online Dictionary of Library and Information Science [home, info]
33. Period: Virginia Tech Multimedia Music Dictionary [home, info]
34. period: Silva Rhetoricae: The Forest of Rhetoric [home, info]
35. period: Global Glossary [home, info]
36. period: ArtLex Lexicon of Visual Art Terminology [home, info]

Business (4 matching dictionaries)

37. period, Period (punctuation), Period (grammar), Period (disambiguation): Legal dictionary [home, info]
38. Period: Construction Term Glossary [home, info]
39. period: INVESTORWORDS [home, info]
40. Period: MoneyGlossary.com [home, info]

Computing (1 matching dictionary)

41. period, Period (physics), Period (mathematics), Period (feminine), Period (disambiguation): Encyclopedia [home, info]

Medicine (3 matching dictionaries)

42. period, Period (physics), Period (gene), Period (feminine), Period (disambiguation): Medical dictionary [home, info]
43. period: online medical dictionary [home, info]
44. Period (menstrual): Merck Manuals [home, info]

Miscellaneous (2 matching dictionaries)

45. period: Idioms [home, info]
46. PERIOD: Navajo Code Talkers' Dictionary [home, info]

Science (14 matching dictionaries)

47. period: Anthropology dictionary [home, info]
48. period, period, period, period: PlanetMath Encyclopedia [home, info]
49. period: General Chemistry Online [home, info]
50. Period: Extragalactic Astronomy [home, info]
51. period: On-Line Biology Book: GLOSSARY [home, info]
52. period: MATH SPOKEN HERE! [home, info]
53. Period: Eric Weisstein's World of Physics [home, info]
54. Period: Eric Weisstein's World of Mathematics [home, info]
55. Period: Eric Weisstein's World of Chemistry [home, info]
56. period: Earthquake Image Glossary [home, info]
57. Period: LITHICS-NET's Glossary of Lithics Terminology [home, info]
58. period: Archaeology Wordsmith [home, info]
59. Period: Chemistry Dictionary [home, info]

Slang (1 matching dictionary)

61. period: The Folk File [home, info]

Sports (2 matching dictionaries)

62. period, period: Hickok Sports Glossaries [home, info]
63. period: Sports Terms [home, info]

Tech (10 matching dictionaries)

64. Period: Electrical Engineering Glossary [home, info]
65. Period: Sweetwater Music [home, info]
66. period: SeaTalk Dictionary of English Nautical Language [home, info]
67. period: Rane Professional Audio Reference [home, info]
68. Period: Dictionary for Avionics [home, info]
69. PERIOD: NOISE CONTROL TERMS [home, info]
70. period: Glossary of Meteorology [home, info]
71. period: DOD Dictionary of Military Terms [home, info]
72. Period: AUTOMOTIVE TERMS [home, info]
73. period: Electronics [home, info]

(Note: See periods for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (period) ▸ noun:  a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations ("In England they call a period a stop") ▸ noun:  the end or completion of something ("Death put a period to his endeavors") ▸ noun:  a unit of geological time during which a system of rocks formed ("Ganoid fishes swarmed during the earlier geological periods") ▸ noun:  one of three periods of play in hockey games ▸ noun:  the interval taken to complete one cycle of a regularly repeating phenomenon ▸ noun:  a stage in the history of a culture having a definable place in space and time ("A novel from the Victorian period") ▸ noun:  an amount of time ("A time period of 30 years") ▸ noun:  the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause ▸ Also see periods ▸ Word origin ▸ Words similar to period ▸ Usage examples for period ▸ Popular adjectives describing period ▸ Words that often appear near period ▸ Rhymes of period ▸ Invented words related to period