substack

noun

1. A subset of a stack.

   “In particular, we give necessary and sufficient conditions for the existence of Poincar\'e bundles over the universal curve of an open substack of the rigidification, generalizing a result of Mestrano-Ramanan..”

2. A publication published via this platform.

   “I've been reading her Substack for a while now.”

   “There are several Substacks that are worth watching for insightful coverage of this space.”

name

1. An online publishing platform for newsletters and journalism.

   “They're on Substack and they also have a YouTube channel.”