- ad lib
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[ad lib 词源字典] - 1811, shortened from Latin ad libitum "at one's pleasure, as much as one likes" (c. 1600), from ad "to" (see ad-) + libitum, accusative of libere "to please" (see libido). First recorded as one word 1919 (v.), 1925 (n.).[ad lib etymology, ad lib origin, 英语词源]