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primary element
math.	прима́рний елеме́нт; пра́ймерний елеме́нт
robot.	перви́нний елеме́нт; основний елемент
English thesaurus
primary element
metrol.	The primary element of a measuring chain which converts the input variable into a signal suitable for measurement

primary element : 3 phrases in 2 subjects

Aviation	1
Mathematics	2