1) Latin legal terminology 
Ex tunc is a legal term derived from Latin, and means `from the outset`. It can be contrasted with ex nunc, which means `from now on`. An example of usage of the term can be found in contract law, where avoidance of a contract can lead to it either being void ex nunc, i.e. from then on, or ex tunc, in which case it is treated as though it had ...