The specific vocabulary and terminology of Greek life are essential to its identity. While it doesn't use the Greek language, it honors ancient Greek traditions through Greek letters, symbols, and the alphabet. Sororities and fraternities use these extensively, with each chapter named after a unique combination of Greek letters, such as Theta Phi Alpha. However, the lexis mainly consists of American English terms with unique meanings in the Greek life community. For example, "chapters" refer to meetings, "minutes" are meeting records, "recruitment" is the joining process, a "chapter" is a local unit of the organization, and a "legacy" is a student with a family member who is an initiated member.

Effective communication is crucial for maintaining the operational integrity and dynamics of a discourse community. In Theta Phi Alpha, members use various technological and in-person communication methods. They utilize GroupMe for event details and updates, as well as social media apps like Snapchat, Instagram, and Facebook. These platforms share important information, document special moments, and offer potential new members a glimpse of Theta Phi Alpha’s values and experiences.

Another significant form of communication between members is in-person meetings, also known as chapters. Chapters are unique to Theta Phi Alpha because they provide a place for the whole group to communicate critical information, share ideas, and vote on matters that are unique to Theta Phi Alpha. It is also a place where all members can unite in a confidential, sacred, and safe environment.

One of Theta Phi Alpha's essential genres is documented notes, or "minutes." These records capture key information from chapter meetings, such as discussions, decisions, plans, commentary, and resource links. The sorority's secretary, an elected position, is responsible for creating and publishing these minutes, ensuring smooth and efficient operations. Minutes are accessible to all current members for future reference and learning.

Another important genre is the "Constitution and Bylaws," a private document outlining Theta Phi Alpha's rules and amendments. Access to these confidential documents is restricted to members and is part of the new member initiation process. The documents are available through the OurHouse app/website, a secure platform for storing fraternity records. They are also included in Theta Phi Alpha’s Ritual book, which details the chapter's rituals.