It is an abbreviation for advertisement.
Another term for ad lib is improv, or improvise.
Its very simple, -Ad- is the short term for advertisment.
AD is after the birth of christ, so we're in 2008 AD. The term AD stands for Anno Domini, Latin for 'in the year of our lord'.
It is a term of agreement
Ad lib in medical terms means as much as the patient wants.
Let's see, here in 2013 AD, 444 AD was 1569 years ago. The term Anno Domini (AD) is Medieval Latin, translated as "In the year of the Lord".
So you are asking me to create a sentence ad hoc? The judgeship was only an ad hoc appointment to clear a backlog on the docket.
OOB ad lib, or out of bed ad lib or as desired.
Russia was consolidated from scattered duchies in 14th Century AD, so the birthday of the term "Russia" referring to a single big State is in AD.
The term CE stands for Common Era, it takes the place of AD. The term BCE means Before Common Era and takes the place of BC. A politically correct term as the entire world is not Christian and AD and BC have Christian connotations.
It is a phrase, not a term. The phrase is reductio ad absurdum.
Curator ad litem is a Scotch term for someone who represents a mentally incapacitated person or a child in a court case. In America, it is called a guardian ad litem.