| stipulation(noun, concern, condition, demand, need) |
| prerequisite(noun, condition, need, essential, certainty) |
| condition(noun, need, essential, essence, basic) |
| necessity(noun, condition, need, essential, essence) |
| requirement(noun, concern, condition, demand, need) |
| must(noun, condition, need, essential, certainty) |
| sine qua non(noun, expression, idiom, condition, need) |
| essential(noun, concern, condition, need, basic) |
| presumption(noun, theory, guesstimate, premise) |
| provision(noun, concern, condition, demand, need) |
| proviso(noun, concern, condition, demand, need) |
| qualification(noun, concern, condition, demand, need) |
| requisite(noun, condition, need, essential, certainty) |
| demand(noun, concern, condition, need, essential) |
| given |
| enabler |
| postulate(noun, condition, essential, theory, requirement) |
| arrangement(noun, condition, essential, requirement, qualification) |
| circumstance |
| consideration |