Agriculture. Of land: Unenclosed, common, as distinct from ‘several’ or ‘enclosed’. Obsolete.

Of land: belonging to or held by a community as a whole; available to a community and allowing traditional rights such as pasturing animals, etc. Cf…

Of the nature of open country; belonging to the open country.

(un-, prefix1 affix 2 affix 3.)

(un-, prefix1 affix 3.)

That may be used in common; commonable.