| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Ivory carving | No definition provided | Christopher Rauch | 2023.12.01 |
| Iwakiite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Iwashiroite (Y) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ixil language | No definition provided | Christopher Rauch | 2023.12.01 |
| Ixiolite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ixodidae | No definition provided | Christopher Rauch | 2023.12.01 |
| Izoklakeite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| J | Projection of a vector along the second namedaxis of a coordinate system. Typically the Y axis, but could be the T axisfor an RTN coordinate system. | Ryan McGranaghan | 2023.04.16 |
| J2000 | An astronomical coordinate system which usesthe mean equator and equinox of Julian date 2451545.0 TT (Terrestrial Time),or January 1, 2000, noon TT. (aka J2000) to define a celestial referenceframe. | Ryan McGranaghan | 2023.04.16 |
| Jabim language | No definition provided | Christopher Rauch | 2023.12.01 |
| Jaborandi | No definition provided | Christopher Rauch | 2023.12.01 |
| Jachimovite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Jachymovite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Jackal | No definition provided | Christopher Rauch | 2023.12.01 |
| Jack Cade's rebellion | No definition provided | Christopher Rauch | 2023.12.01 |
| Jackmel Packet (Brigantine) | No definition provided | Christopher Rauch | 2023.12.01 |
| Jack-rabbits | No definition provided | Christopher Rauch | 2023.12.01 |
| Jacks, Hydraulic | No definition provided | Christopher Rauch | 2023.12.01 |
| Jack-straws (Game) | No definition provided | Christopher Rauch | 2023.12.01 |
| Jacmel Packet (Brigantine) | No definition provided | Christopher Rauch | 2023.12.01 |