Grand Challenge
Noun · Hacker Culture
Definitions
A very large ambitious problem framed as socially or technically important enough to organize significant research, funding, or public effort around it. In innovation culture grand challenges are used to inspire long-horizon work beyond routine incremental optimization.
In plain English: A very large ambitious problem considered important to solve.
Example: "The lab's grant proposal framed trustworthy multilingual reasoning as a grand challenge rather than a narrow product feature because the research implications were much broader."