substack

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noun

A subset of a stack.

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

Scrabble 16
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Meanings

substack1

nounsubstack (plural substacks)

plural substacks

  1. mathematicsA 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..

    2016, Roberto Fringuelli, “The Picard group of the universal moduli space of vector bundles over ̄ℳ_g”, in arXiv

Substack2

proper noun
  1. An online publishing platform for newsletters and journalism.

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

nounSubstack (plural Substacks)

plural Substacks

  1. A publication published via this platform.

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

    1 more example

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

Origin

substack · noun

From sub- + stack.

Full word history & related roots →

Substack · proper noun, noun

Possibly from sub (“subscription”) + stack.

Full word history & related roots →
Cite this entry
APA

substack. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/substack

MLA

“substack.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/substack. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “substack,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/substack.

Source: substack on Wiktionary, CC BY-SA 4.0.