ロピタルの定てい理りMeanings1nounl'Hôpital's rulemathematicsA mathematical theorem used to evaluate limits of indeterminate forms. The spelling 'l'Hospital's rule' is also common in English.ロピタルの定てい理りを使つかって極きょく限げんを求もとめる。Find the limit using l'Hôpital's rule.