| Term | Definition |
|---|---|
| JA | Japan |
| JASS | Joint Assessment of Specific Sites |
| JCT | (ITER) Joint Central Team |
| JET | Joint European Torus, Abingdon, UK |
| Joint Implementation Agreement | JIA, the agreement being negotiated between the ITER participants covering the construction, operation and decommissioning of ITER. |
| JT 60U | Japan Tokamak - 60 Upgrade, more commonly referred to as JT60 Upgrade |
| JWS | (ITER) Joint Work Site |
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