In North America, fraternities and sororities (Latin: fraternitas and sororitas, 'brotherhood' and 'sisterhood') are social clubs at colleges and universities. They are sometimes collectively referred to as Greek life or Greek-letter organizations, as well as collegiate fraternities or collegiate sororities to differentiate them from general, non-university-based fraternal organizations and fraternal orders, friendly societies, or benefit societies.
Generally, membership in a fraternity or sorority is obtained as an undergraduate student but continues thereafter for life by gaining alumni status. Some accept graduate students as well; some also provide honorary membership in certain circumstances. Individual fraternities and sororities vary in organization and purpose, but most – especially the dominant form known as social fraternities and sororities – share five common elements: