microscale noun 3adjective 1forms 1 noun[before a noun]3 •A very small or microscopic scale. •The scale of microanalysis. •A scale of physical consideration or of bounds having a characteristic dimension typically ranging from 1 to 999 µm (under 1 mm). adjective[before a noun]1 •Extending over a relatively small area, particularly less than 1 kilometer; smaller than mesoscale. formsmicroscales