Deviation (noun)

1. A departure or difference from what is normal, usual, or expected.
2. A departure from a standard, especially in a statistical sense.
3. A turning aside from a course, direction, or goal.
4. A departure from a moral or religious standard or principle.
5. A departure from a specified route or plan.

Origin:

Late 16th century: from latin deviatio(n-), from deviare 'to turn away'.

Examples:

1. There was a deviation in the data that indicated a problem with the experiment.
2. The deviation from the planned route was necessary to avoid traffic.
3. The deviation from the budget was due to unexpected expenses.
4. His behavior was a deviation from the usual norms of the company.
5. The deviation from the expected results was significant.