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

Art (5 matching dictionaries)

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

Business (4 matching dictionaries)

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

Computing (1 matching dictionary)

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

Medicine (3 matching dictionaries)

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

Miscellaneous (2 matching dictionaries)

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

Science (14 matching dictionaries)

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

Slang (1 matching dictionary)

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

Sports (2 matching dictionaries)

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

Tech (10 matching dictionaries)

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