low-lev·el • adj. situated relatively near or below ground level: low-level flying was banned. ∎ of or showing a small degree of some measurable quantity, for example radioactivity: the dumping of low-level waste. ∎ of relatively little importance, scope, or prominence; basic: opportunities to progress beyond low-level jobs. ∎ Comput. of or relating to programming languages or operations that are relatively close to machine code in form.