overriding necessity; absolute requirement; absolute must
A formal, emphatic noun for something that must be done or obtained above all else; often used in policy, business, or serious personal contexts.
Ensuring safety is an absolute requirement.
The success of this project is an overriding necessity.
必須 is a common word for 'essential' or 'mandatory', while 至上要求 is a stronger, more formal term for an overriding, non-negotiable demand.
絶対条件 means 'absolute condition' and is similar in strength, but 至上要求 emphasizes the demand or necessity aspect more than a conditional requirement.
Compound of 至上 (supreme, highest) and 要求 (demand, requirement). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese compounding patterns.