| Term | Definition |
| aggression | behavior performed with the intention of harming a living being who is motivated to avoid this treatment |
| hostile aggression | aggressive acts for which the perpetrator's major goal is to harm or injure a victim |
| instrumental aggression | aggressive acts for which the perpetrator's major goal is to gain access to objects space, or priviledges |
| conflict | circumstances in which two or more persons have incampatible needs, desires, or goals |
| retaliatory aggression | aggressive acts elicited by real or imagined provocations |
| relational aggression | acts such as snubbing, exclusion, withdrawing acceptance, or spreading rumors that are aimed at damaging an adversary's self-esteem, friendships, or social status |
| proactive aggressors | highly aggressive children who find aggressive acts easy to perform and who rely heavily on aggression as a means of solving social problems, or achieving other personal objectives |
| reactive aggressors | children who display high levels of hostile retaliatory aggression because they over-attribute hostile intents to others and cant control their anger long enough to seek non-aggressive solutions to social problems |
| hostile attributional bias | tendency to view harm done under ambiguous circumstances as having stemmed from a hostile intent on the part of the harmdoer; characterizes reactive aggressors |
| passive victims | socially withdrawn, anxious children with low self-esteem whom bullies torment, even though they appear to have done little to trigger such abuse. |
| provocative victims | restless, hot-tempered, and oppositional victims because they often irritate their peers |
| coercive home environment | a home in which family members often annoy one another and use aggressive or otherwise anti-social tactics as a method of coping with these aversive experiences |
| negative reinforcer | any stimulus whose removal or termination as the consequence of an act will increase the probability that the act will recur |
| incompatible response behavior | a non-punitive method of behavior modification in which adults ignore undesirable conduct while reinforcing acts that are incompatible with these responses |
| timeout technique | a form of discipline in which children who misbehave are removed from the setting until they are prepared to act more appropriately. |