齐 (qí) — (adjective) neat, even, uniform; (adverb) simultaneously, all together; (verb) to make even, to align

齐 (qí) is an adjective meaning 'neat, even, uniform' — close to 整齐, but 齐 also works as an adverb ('all together, in unison') or verb ('to align'). 均匀 stresses equal distribution; 一齐 is the adverb form for 'simultaneously'.