1.
essential, indispensable, mandatory, required
Something that is absolutely necessary and cannot be done without. Used for requirements, qualifications, conditions, and items.
この仕事には英語力が必須だ。
English ability is essential for this job.
応募には必須項目をすべて記入してください。
Please fill in all required fields to apply.
災害対策として非常食の備蓄は必須である。
Stockpiling emergency food is essential as a disaster preparedness measure.
USAGE:
Functions as both a na-adjective (必須な / 必須の) and a predicate noun (必須だ / 必須である). Very common in job listings, academic requirements, and technical documentation. Often appears in compound nouns like 必須条件 and 必須科目.
COMMON COLLOCATIONS:
- 必須条件: essential requirement
- 必須科目: required subject/course
- 必須項目: required field/item
- 必須アミノ酸: essential amino acid