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English thesaurus
essential item stresses
mil., logist.	Item that meets the following operational criteria: 1. essential for the operational use of the equipment; 2. repairable or exchangeable at the NTI1 and NTI2 maintenance levels less 12 hours. (FRA)

essential item : 3 phrases in 3 subjects

Astronautics	1
Military	1
Weapons of mass destruction	1