1
general::
Phrase(s): in advance
[of something given, paid, or provided] before it is due. • The bill isn’t due for a month, but I paid it in advance. • I want my pay in advance.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Beforehand, ahead of time. For example, He insisted on being paid half his fee in advance. 2. In advance of. In front of, as in The point man moved in advance of the squad. [Mid-1600s]
American Heritage Idioms