noun
total number of trainees
Used in educational or training contexts to refer to the cumulative headcount of participants, counting each person each time they attend.
今年度の延べ受講者数は1万人を超えた。
The total number of trainees this fiscal year exceeded 10,000.
Compound of 延べ (nobe, 'cumulative total') + 受講者 (jukōsha, 'trainee, course participant') + 数 (sū, 'number').