XO
| Acronym | Definition |
|---|---|
| XO | Executive Officer |
| XO | Christo (Latin: To Christ, epigraphy) |
| XO | Extra Old |
| XO | Xanthine Oxidase (enzyme) |
| XO | Crystal Oscillator |
| XO | Turner's Syndrome (disorder) |
| XO | eXtra Ordinary |
| XO | Hug and Kiss |
| XO | Extremely Old |
| XO | Excess Officer (US Military humor) |
| XO | Crossover Track (railroads) |
| XO | Expenditure Order |
| XO | Genetic Code for Turner's Syndrome |