An adverb meaning exactly, neatly, or properly — indicating that something is done accurately or in order; similar to きちんと.
書類はきちっと揃えて提出してください。
Please submit the documents neatly arranged.
彼は約束の時間にきちっと来る人だ。
He is someone who arrives exactly on time for appointments.
数字はきちっと計算しなければならない。
You must calculate the numbers accurately.