| Rank | Abbreviation | Meaning |
|---|
| ***** | HCAS | Headphone Colleague Alert System
| |
| ***** | HCAS | Hydraulic Capacity Alert System
| |
| **** | HCAS | Home Care Aides
| |
| **** | HCAS | HIPAA Compliant Auditing System
| |
| **** | HCAS | heterocyclic aromatic amines
| |
| **** | HCAS | Human Capital Advisory Services
| |
| **** | HCAS | Human Capital Assessment System
| |
| **** | HCAS | Holy Child Auxilium School
| |
| **** | HCAS | Host Channel Adapters
| |
| **** | HCAS | human coronary arteries
| |
| *** | HCAS | human coronary artery smooth muscle cells
| |
| *** | HCAS | High Consequence Areas
| |
| *** | HCAS | heterocyclic amines
| |
| *** | HCAS | Habitat Conservation Areas
| |
| *** | HCAS | Health Care Advocacy Service
| |
| *** | HCAS | Hindustan College of Arts Science
| |
| *** | HCAS | High Cost Ancillary Services
| |
| *** | HCAS | Harford County Astronomical Society
| |
| ** | HCAS | Humanitarian and Civic Assistance
| |
| ** | HCAS | health care assistants
| |
| ** | HCAS | Health Care Answering Services
| |
| ** | HCAS | Hillsdale County Agricultural Society
| |
| ** | HCAS | Howard County Autism Society
| |
| ** | HCAS | Harvard Committee on African Studies
| |
| ** | HCAS | Homes and Condos Are Still
| |