| |||
| less frequent; less often; more rare; rarer; scarcer | |||
| |||
| infrequently; seldomly considered bad grammar, better: seldom; unfrequent | |||
| infrequent; rare | |||
|
seltener : 92 phrases in 26 subjects |
| American usage, not spelling | 1 |
| Astronomy | 1 |
| Boxing | 1 |
| Business | 2 |
| Chemistry | 2 |
| Communications | 3 |
| Earth sciences | 9 |
| Economics | 1 |
| Environment | 4 |
| General | 26 |
| Geology | 1 |
| Health care | 12 |
| Hobbies and pastimes | 1 |
| Law | 1 |
| Mathematics | 1 |
| Medical | 5 |
| Microelectronics | 1 |
| Microsoft | 2 |
| Mining | 3 |
| Nuclear physics | 1 |
| Optics branch of physics | 1 |
| Ornithology | 1 |
| Pharmacy and pharmacology | 5 |
| Physics | 3 |
| Polygraphy | 2 |
| Technology | 2 |