| essential ionic equation | persamaan ion perlu | Fizik | Tiada | Tiada |
| essential singularity | kesingularan penting | Fizik | Tiada | Tiada |
| essential spectrum | spektrum perlu | Fizik | Tiada | Tiada |
| essential reaction | tindak balas perlu | Fizik | Tiada | Tiada |
| essential supremum | supremum perlu | Fizik | Tiada | Tiada |
| essential state | keadaan perlu | Matematik | Tiada | Tiada |
| essential singular point | titik singular penting | Matematik | Tiada | Tiada |
| essential singularity | kesingularan penting | Matematik | Tiada | Tiada |
| essential features (of behaviour) | ciri penting (tingkah laku) | Pendidikan | Tiada | Tiada |
| essential (psychology) | teras (kaji jiwa) | Pendidikan | Tiada | Tiada |