Hypothesis means several things, but I think (and Wikipedia roughly agrees) that there are two main senses:
A. Epistemological - a tentative affirmation, posed as explanation for a phenomenon. In the context of scientific method, a (scientific) hypothesis should be testeable by experience. When it's (up to some degree) tested, accepted, articulated within a rational system, it forms part of a scientific theory.
B. Logical - as in formal logic (and mathematics). Antecedent of a conditional proposition, premise of a theorem. Its truth is not relevant per se, only conditionally. If it's true, then the conclusion (or the thesis) is true.
Now, I've seen sometimes the terms "thesis" and "hypothesis" used in the following sense:
- hypothesis is a tentative, untested (or insuficciently tested) theory to explain some facts
- when it's tested and accepted, then it is promoted as a thesis
This looks to me as artifical and wrong, as it mixes senses (epistomological sense of "hypothesis" and logical sense of "thesis"). And that "promotion", in reality, does not take place, not with those terms. As long as I see, the scientific community does not uses the word "thesis" in that sense.
Have you seen (or used) those terms in that sense? Do you think it's justified?