subtotal adjective 1noun 1verb 1forms 5 adjective1 •Less than total; partial.A subtotal thyroidectomy usually prevents the recurrence of hyperthyroidism because only enough of the gland is left to maintain normal function. — 2007 noun1 •The total for a part of a list of numbers being summed. verb1 •To calculate a subtotal. formssubtotaled · subtotalled · subtotaling · subtotalling · subtotals