“architecture decisions are those that must be made from a system perspective to achieve system outcomes (identity and purpose, capabilities and properties of the system)”
— Dana Bredemeyer

Good to add to characterizations here (and in comments/replies):
https://www.linkedin.com/posts/ruth-malan-4558153_i-have-made-frequent-use-of-and-so-appreciate-activity-7368764683677331458-krBg