A disagreement or argument.
The result of a subtraction; sometimes the absolute value of this result.
An addition to a coat of arms to distinguish two people's bearings which would otherwise be the same. See augmentation and cadency.
A characteristic of something that makes it different from something else.
The quality of being different.
The quality or attribute which is added to those of the genus to constitute a species; a differentia.
The set of elements that are in one set but not another ( scriptstyle A◌̅B).
Significant change in or effect on a situation or state.
A Boolean operation which is true when the two input variables are different but is otherwise false; the XOR operation ( scriptstyle A◌̅B+◌̅AB).
An unforeseen obstacle to progress; a hitch or delay.
An emotional difficulty or a psychological inhibition; a complex.