Question: What period of usage does the Oxford English Dictionary specify for the language that the Findern Manuscript was written in?

Context paragraphs:
Shorter Oxford English Dictionary: The Shorter Oxford English Dictionary (SOED) is an English language dictionary published by the Oxford University Press.  The SOED is a two-volume abridgement of the twenty-volume "Oxford English Dictionary" ("OED").

Concise Oxford English Dictionary: The Concise Oxford English Dictionary (officially titled The Concise Oxford Dictionary until 2002, and widely abbreviated COD or COED) is probably the best-known of the 'smaller' Oxford dictionaries.  The latest edition of the "Concise Oxford English Dictionary" contains over 240,000 entries and 1,728 pages (concise only compared to the "OED" at over 21,000 pages).  Its 12th edition, published in 2011, is used by both the United Nations and NATO as the current authority for spellings in documents written in English for international use.  It is available as an e-book for a variety of handheld device platforms.  In addition to providing information for general use, it documents local variations such as United States and United Kingdom usage.

Oxford Dictionary of English: The Oxford Dictionary of English (ODE) is a single-volume English dictionary published by Oxford University Press, first published in 1998 as The New Oxford Dictionary of English (NODE).  The word "new" was dropped from the title with the Second Edition in 2003.  This dictionary is not based on the "Oxford English Dictionary" and should not be mistaken for a new or updated version of the OED.  It is a completely new dictionary which strives to represent as faithfully as possible the current usage of English words.

Wordhunt: Wordhunt was a national appeal run by the "Oxford English Dictionary", looking for earlier evidence of the use of 50 words and phrases in the English language.  New evidence found by members of the public in response to the appeal appears in the "Oxford English Dictionary".  The appeal is a companion to the BBC2 television series "Balderdash and Piffle".

Edmund Weiner: Edmund Weiner (born 27 August 1950 in Oxford, England) was co-editor (with John A. Simpson) of the Second Edition of the "Oxford English Dictionary" (1985–1989) and Deputy Chief Editor of the "Oxford English Dictionary" (1993–present).  He originally joined the OED staff in 1977, becoming the dictionary's chief philologist.

Findern Manuscript: The Findern Manuscript (CUL MS Ff.1.6) is a paper codex written entirely in Middle English and compiled in the fifteenth and early sixteenth centuries by a series of gentry who were neighbors in the countryside of Derbyshire.  A list of its major texts creates a “greatest hits” of fourteenth-century secular love literature; however the volume also contains around two dozen anonymous lyrics, which have been added in the blank spaces left at the bottoms of pages and the ends of quires.  There are several names and scribal signatures written into the book, including the names of five women.

Middle English: Middle English (ME) is collectively the varieties of the English language spoken after the Norman Conquest (1066) until the late 15th century; scholarly opinion varies but the Oxford English Dictionary specifies the period of 1150 to 1500.  This stage of the development of the English language roughly followed the High to the Late Middle Ages.

Oxford Advanced Learner's Dictionary: The Oxford Advanced Learner's Dictionary (OALD) was the first advanced learner's dictionary of English.  It was first published 69 years ago.  It is the largest English-language dictionary from Oxford University Press aimed at a non-native audience.  Users with a more linguistic interest, requiring etymologies or copious references, usually prefer the "Concise Oxford English Dictionary", or indeed the comprehensive "Oxford English Dictionary", or other dictionaries aimed at speakers of English with native-level competence.

Clive Upton: Clive Upton is a professor of English language at the University of Leeds, England, specializing in dialectology and sociolinguistics.  He has acted as a consultant on British pronunciation for the English-language dictionaries published by Oxford University Press, including the "Oxford English Dictionary", the "Shorter Oxford English Dictionary", and the "Concise Oxford Dictionary".  He was also responsible for the British element of the "Oxford Dictionary of Pronunciation for Current English" (2001).

Oxford spelling: Oxford spelling (also "Oxford English Dictionary" spelling, Oxford style, or Oxford English spelling) is the spelling standard used by the Oxford University Press (OUP) for British publications, including its "Oxford English Dictionary" ("OED") and its influential British style guide Hart's Rules, and by other publishers who are "etymology conscious", according to Merriam-Webster.

Supporting paragraphs: Findern Manuscript Middle English
Answer: 1150 to 1500