About career break in CV I am going to apply for a postdoc position and there is an item about career break. 
Having finished my Master degree, I got a position titles Director of Research in a College for about 6 years. In the meanwhile, I was visiting lecturer for some courses for different academic levels such as sub-bachelor, Bachelor students. After that experience I was involved in a research project as an assistant professor, then after 6 months  I commenced my Ph.D studies. I do not know whether the years before stating Ph.D ( 6 years as lecturer and director of research) is career break or not?
I suspect that the intent of the question is to have you explain things that you did completely unrelated to your career and to your field. As such, the things you describe don't seem to qualify. I don't think they are necessarily asking about breaks in your academic progress (time between degrees), but they might be interested in that. 

But the sorts of things you did prior to the doctorate would seem, to me, to be supportive of your case for the position and so should be mentioned somehow in your CV whether in this "section" or just in a narrative. 

Some people need to take a career break to care for an ailing parent or child, for example, or because they are in jail (oops). In such breaks it may be impossible to do much professionally. Those need to be explained if they last more than a few months.