QCA Views 10 meanings found QCA is most often seen in business as a label for quality‑control roles, analyses and compliance programs, while in tech circles it can refer to the Qt Cryptographic Architecture or a repository for quantum‑computing research. Medical Quantitative Coronary Analysis Miscellaneous Quarter Century Award Academic & Science Qualifications And Curriculum Authority Quasi- Crystalline Approximation Computing Qt Cryptographic Architecture Business Quality Control Analyst Quality Control Analysis Quality Compliance Assurance Quantum Computation Archive Quoted Companies Alliance