discommon
To deprive of the privilege of citizenship of a town or city.
historical
Let us not leave our fellowship, and estrange our selves from Gods people[…]To be discommoned a Town, or for a Citizen to be banished a city, is a great evill: But to be an exile from Gods city, and discommoned [i.e. excommunicated] from the communion of Saints, this is lamentable indeed.
To deprive (lands etc.) of commonable quality, by enclosing or appropriating.
historical
She saw in front of her a two-storey house, standing back from the gravel pathway, on the edge of a triangular piece of turf which represented, no doubt, a more extensive village green, now discommoned and taken in by the private dwellings scattered around.
To exclude from using a commonable resource, such as land.
I know we may by way of admonition, before hand, tell them of the danger, and by way of perswasion presse them better to prepare themselves: but wee may not for their sakes discommon our selves from the table of the Lord .
To deprive of the right to deal with undergraduates.
historical, transitive
[…] persons violating the above statute are liable to a fine for the first offence, and to be discommoned for the second.
Where it comes from
From Middle English discomyned, discomynned, dyscomynyd (participle); equivalent to dis- + common.
Adapted from the Wiktionary entry discommon (CC BY-SA 4.0).