| prohibition(noun, restraint, limitation, constraint, restriction) |
| proscription(noun, restraint, limitation, constraint, restriction) |
| restraint(noun, limitation, constraint, restriction, fetter) |
| stricture(noun, restraint, limitation, constraint, restriction) |
| demand(noun, state, position, situation, status) |
| essential(noun, state, position, situation, status) |
| must(noun, state, position, situation, status) |
| necessity(noun, state, position, situation, status) |
| need(noun, state, position, situation, status) |
| precondition(noun, state, position, situation, status) |
| prerequisite(noun, state, position, situation, status) |
| requirement(noun, state, position, situation, status) |
| requisite(noun, state, position, situation, status) |
| sine qua non(noun, expression, state, position, situation) |
| advantage(noun, state, position, situation, status) |
| condition(noun, state, position, situation, status) |
| contingency(noun, state, position, situation, status) |
| desideration(noun, state, position, situation, status) |
| desideratum(noun, state, position, situation, status) |
| edge(noun, state, position, situation, status) |