| essential(noun, condition, need, basic, requirement) |
| requirement(noun, condition, need, essential, certainty) |
| necessity(noun, condition, need, essential, essence) |
| prerequisite(noun, condition, need, essential, certainty) |
| requisite(noun, condition, need, essential, certainty) |
| must(noun, condition, need, essential, certainty) |
| condition(noun, essential, essence, basic, theory) |
| fundamental(noun, part, need, essential, certainty) |
| precondition(noun, condition, need, essential, certainty) |
| need(noun, condition, essential, requirement, necessary) |
| provision(noun, condition, essential, requirement, qualification) |
| stipulation(noun, condition, essential, requirement, qualification) |
| proviso(noun, condition, essential, requirement, qualification) |
| qualification(noun, condition, essential, theory, requirement) |
| demand(noun, condition, need, essential, requirement) |
| terms(noun, condition, essential, reservation, requirement) |
| catch(noun, condition) |
| core(noun, heart, essential, essence, basic) |
| cornerstone(noun, law, foundation, basic, stipulation) |
| desideratum(noun, need, essential, requirement, prerequisite) |