#1 low-level s. not intense; "low-level radiation". wn
#2 low-level a. [subordinate] lower in rank or importance. wn
#3 low-level s. at a low level in rank or importance; "a low-level job"; "low-level discussions". wn
#4 low-level s. [low-altitude] occurring at a relatively low altitude; "a low-level strafing run". wn
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