There are several verbs that when used in specific ways open the door to new possibilities. Let's look at the combination, A partir de and how this one can be used. The Portuguese verb PARTIR means: to leave, depart, go away.
a partir de
When combined like this, partir takes on the meaning: starting from
a partir de = literally, to depart from
When you use it like this you all of a sudden can say things like, from now on, starting next week, from $100 on, from there to here and so on.
Here's how it gets used to express, starting from:
* Note here that it's da instead of de because we have to include (contract) a semana: a partir de a semana que vem = a partir da semana que vem.
* The de + aqui contracts to daqui.