| Subject | English | French |
| gear.tr. | axis of instantaneous rotation | axe de révolution instantané |
| astr. | instantaneous axis | axe instantané (of rotation, de rotation) |
| mech.eng. | instantaneous axis | axe instantané |
| gear.tr. | instantaneous axis | axe de révolution instantané |
| tech. | instantaneous axis | axe de rotation instantané |
| construct. | instantaneous axis of rotation | axe de rotation instantané |