Some of us were at first, too! But as this blog post by Sorority Ever After points out,
Active [Member]/Brother/Sister: A fully-initiated member of a Greek chapter
Alum/alumna (plural forms - alumni/alumnae): A member who has graduated
Bid: A formal invitation to join a chapter
Chapter: The local group which represents a segment of the national organization
Formal Recruitment: The period set aside for the structured recruitment period - for Furman, this is one week in January, at the beginning of spring term
Fraternity: A Greek organization typically for men (Kappa is technically a fraternity - a women's fraternity!)
Greek: A member of a fraternity or sorority
Pan-Hellenic Council: Governing board of historically Black Greek-lettered fraternities and sororities
Initiation: The time at which a new member is made a full member.
Interfraternity Council: Governing board of all social fraternities.
(Inter)National: Usually refers to the central organization of a given fraternity or sorority.
New Member: A member of a greek organization who has not yet been initiated
National Panhellenic Council: Governing body of Kappa Kappa Gamma and dozens of other sororities
Philanthropy: A charitable project sponsored by an organization; many sororities have both local and national philanthropies
Pledgeship: The time during which new members learn about the fraternity or sorority they are joining
Ritual: Traditional, secret beliefs and processes of a sorority or fraternity
Recruitment/Rush: The process by which a fraternity or sorority recruits new members
Potential New Member: A person interested in becoming a member of a fraternity or sorority
Sorority: A Greek organization for women