perfect attendance (no lateness); never being late
Used for a record of zero lateness over a period, such as a school term or work evaluation. Often appears in contexts like 無遅刻賞 (perfect attendance award).
He was commended for having no lateness for a whole year.
I managed to achieve zero lateness this month.
Compound of 無 (mu, 'without') and 遅刻 (chikoku, 'lateness'). The exact historical derivation is uncertain, but the word follows a common pattern of negating a noun with 無-.