Definition from Wiktionary, the free dictionary
The citation for this word (http://dictionary.reference.com/browse/agreeance) also states that it is considered obsolete and a bastardization of the word "agreement".
Perhaps this page should note that?
- I've added an obsolete tag. However, it's not a bastardization of "agreement". Widsith 11:09, 29 May 2008 (UTC)