prerequisite

Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

something that is required in advance (Freq. 1)
- Latin was a prerequisite for admission
• Syn:
requirement
• Hypernyms:
duty, responsibility, obligation
• Hyponyms:
precondition, academic requirement, essential condition, sine qua non

II - adjective

required as a prior condition or course of study
• Similar to:
obligatory