The purpose of this dissertation was to examine a group of adult students' learning world languages, literacies, and cultures and their experiences in the World Language and Culture Program (WLCP) at a large western land-grant university in the United States during the spring of 2019. I (the author and primary investigator) am the developer and coordinator of the WLCP. The WLCP is a nonformal language learning program where adult students are engaged in a world language and culture learning experience. At the WLCP, the learners are enrolled in a variety of world language and culture classes (e.g., French, Hebrew, Spanish, and Tajik). Drawing from Simons (2009), I framed my research as a qualitative descriptive case study. I selected seven participants for this study. Data sources included interviews, observations, field notes, and artifacts. The findings for this study showed that the seven participants learned functional literacy practices: reading, speaking, and writing. The participants learned these functional literacy practices through the integration of different task domains within contextualized situations. The participants also learned aspects of cultural practices (e.g., religion, traditions, and geography). As a result, the seven cases demonstrated that the adult students learned functional literacy practices and aspects of cultural practices in an interconnected way in the WLCP. With respect to the participants' experiences, the seven participants experienced emotional engagement (e.g., positive and negative emotions), personal engagement (e.g., self-reflection and self-study), and engagement in relationship building (e.g., student-student and student-teacher relationships). In conclusion, the learners in this study had positive learning experiences. Thus, nonformal learning settings, such as the setting described in this study, can positively impact adult students' learning. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]