adverb taking the 'to' particle, adverb
correctly; properly; accurately
Mimetic adverb emphasizing doing something exactly as it should be done, without cutting corners. Often used with する or と.
書類をきちんきちんと整理した。
I organized the documents neatly and properly.
彼はいつも時間をきちんきちんと守る。
He always keeps time punctually.