Ad hoc is a Latin phrase meaning literally 'to this'. In English, it generally signifies a solution designed for a specific problem or task, non-generalizable, and not intended to be adapted to other purposes

Training neurosurgical residents about intraoperative decision-making appears to be ad-hoc and dependent on both the institution and the availability and willingness of senior surgeons to make this a part of their pedagogy ¹⁾.