edge cases

Noun

edge case (plural edge cases)

1. A problem or situation that occurs only at an extreme (maximum or minimum) operating parameter or under other unusual operating conditions.
2. (broadly) Any extremely rare situation.
   • (It's possible that at least some of the liberals who answered "yes, violence can sometimes be justified" had in mind edge cases like armed resistance by Jews against the SS, not the assassination of peaceful political pundits with whom they disagree.)2025 September 16, Jack Nicastro, “J.D. Vance Says 26 Percent of Young Liberals Justify Political Violence. Here's What the Data Really Say.”, in Reason, archived from the original on 06 Oct 2025
3. (broadly) Any unexpected input or user behaviour.
   • The first thing to do is analyze the situation and determine whether the need to provide additional use is an edge case, or if it will become a common use-case scenario.2010, Charles Edge, William Barker, Beau Hunter, Gene Sullivan, Ken Barker, Enterprise Mac Security: Mac OS X Snow Leopard, Apress, →ISBN, page 96

   Synonyms:

   corner case