| Acronym | Definition |
|---|
| XCS➣Cross Country Skiing |
| XCS➣Xchanging Claims Services (UK) |
| XCS➣Xerox Computer Services (Los Angeles, CA) |
| XCS➣Xenos Christian Schools (Columbus, OH) |
| XCS➣Xerographic Copier Service |
| XCS➣XMM (X-Ray Multi-Mirror) Cluster Survey (galaxy survey) |
| XCS➣Experimental Contamination Studies |