According to OED:
1.1 trans. To give or put in (obs.); to take in, include, inclose; esp. to take in, inclose or reclaim (waste or unprofitable land). Now dial.
A few examples from OED:
1592 Bacon Observ. Libel in Resuscitatio (1661) 113 Wast, and unprofitable Ground Inned, Reclaimed, and Improved. 1640 Somner Antiq. Canterb. 290 Appledore mershes were inned in his time. 1852 Humber Conserv. Act 2038 Any part of the shores‥shall be inned, gained, or reclaimed from the water. 1875 Parish Sussex Gloss. s.v., I inned that piece of land from the common.
Collins Dictionary provides an even broader definition:
- to enclose
I cannot understand precisely what the verb's meaning is in this context, even though many examples can be found on Google Books. It is often used in reference to marshes, but also to lands and grounds.
The question is: what is the precise meaning in this case? Enclosed as separated from other lands? Included as moved under the right of property? Reclaimed as dried? All of these? Or do I miss something?