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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 (disambiguation), Period (gene), Period (geology), Period (mathematics), Period (mixtape), Period (music), Period (periodic table), Period (physics), Period (punctuation), Period (punctuation mark), 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