XLA Views 5 meanings found XLA primarily identifies the rare immunodeficiency X‑linked agammaglobulinemia in medical literature, and it is also used for Excel add‑ins and software libraries in computing. Medical X- Linked Agammaglobulinaemia Miscellaneous X Linked Agammaglobulinemia Computing Excel Add-in macro sheet Xlib graphics library Archive Business Xcelera.Com, Inc.