o·ver·due / ˌōvərˈd(y)oō/ • adj. not yet having arrived, happened, or been done, though after the expected time: reform is now overdue. ∎ (of a payment) not having been made, though required: the rent was nearly three months overdue. ∎ (of a woman) having gone beyond the expected time for a menstrual period. ∎ (of a baby) not having been born, though beyond full gestation: our daughter was six days overdue. ∎ having deserved or needed something for some time: she was overdue for some leave. ∎ (of a library book) retained longer than the period allowed.