exception

noun

• The act of excepting or excluding; exclusion; restriction by taking out something which would otherwise be included, as in a class, statement, rule.
• That which is excepted or taken out from others; a person, thing, or case, specified as distinct, or not included.

  "That rule is usually true, but there are a few exceptions."

• An objection, on legal grounds; also, as in conveyancing, a clause by which the grantor excepts or reserves something before the right is transferred.
• An objection; cavil; dissent; disapprobation; offense; cause of offense; — usually followed by to or against.
• An interruption in normal processing, typically caused by an error condition, that can be handled by another part of the program.