I. adverb Etymology: New Latin, in accordance with desire Date: 1610 ad lib , II. adjective Date: circa 1801 omissible according to a performer's wishes
AD LIBITUM
Meaning of AD LIBITUM in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012