| Term | Definition |
| social psychology | the scientific study of how we think about, influence, and relate to one another |
| prejudice | an unjustifiable attitude toward a group and its members |
| stereotype | a generalized belief about a group of people |
| discrimination | unjustifiable negative behavior toward a group or its members |
| ingroup | "us" - people with whom one shares a common identity |
| outgroup | "them" - those perceived as different or apart from one's ingroup |
| ingroup bias | the tendency to favor one's own group |
| scapegoat theory | the theory that prejudice offers an outlet for anger by providing someone to blame |
| just-world phenomenon | the tendency of people to believe the world is just and that people therefore get what they deserve and deserve what they get |
| aggression | any physical or verbal behavior intended to hurt or destroy |
| frustration-aggression principle | the principle that frustration creates anger, which can generate aggression |
| mere exposure effect | the phenomenon that repeated exposure to novel stimuli increases liking of them |
| passionate love | an aroused state of intense positive absorption in another, usually present at the beginning of a love relationship |
| companionate love | the deep affectionate attachement we feel for those with whom our lives are intertwined |
| equity | a condition in which people receive from a relationship in proportion to what they give to it |
| self-disclosure | revealing intimate aspects of oneself to others |
| altruism | unselfish regard for the welfare of others |
| bystander effect | the tendency for any given bystander to be less likely to give aid if other bystanders are present |
| conflict | a perceived incompatibility of actions, goals, or ideas |
| superordinate goals | shared goals that override differences among people and require their cooperation |
| GRIT | Graduated and Reciprocated Initiatives in Tension-Recduction; a strategy designed to decrease international tensions |