From en.wiktionary.org:
** English
*** Etymology
From [en].
*** Adjective
[-]
1. [en] That does not use inflection .
2. [en] That has not been inflected .
3. * 1955 : Geoffrey Chaucer, Richard Middlewood Wilson, Simon Bredon, Derek John de Solla Price, and Peterhouse (University of Cambridge) Library, _The Equatorie of the Planetis_ , page 161 (see http://books.google.co.uk/books?id=d44LAQAAIAAJ&dq=%22grada,+minuta,+introitus%22&lr=&ei=IjA1SoHDBp-8zASF-_i1Bg) (Cambridge University Press)
4. *: It seems that many such technical words (grada, minuta, introitus) were left in the UNINFLECTED state when contracted in any customary form such as we have [...]
**** Translations
[of a language] [trans-bottom]
[of a word]
- Czech: [cs]
- Dutch: [nl]
- Greek: [el]
- Hungarian: [hu]
- Polish: [pl]
[trans-bottom]