I have a very basic doubt regarding what the tectonic plates mean. In Wiki article Subduction is defined as:
Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries.
and when I follow the link to convergent boundary it is defined as:
A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide.
Now from what I know is that the tectonic plates comprise of oceanic and continental crust and convergent and divergent boundaries exist where two tectonic plates meet. So this subduction should only happen where two or more major or minor plates meet and not between continental crust and oceanic crust. So do plates sometime refer to crust as well and there are more minor and major plates which are still not defined.
Edit: Is there a possibility of subduction between continental crust and oceanic crust of the same plate?(If answer is yes then these crusts can also be called plates).