Definition:
Hypothesis is a proposed explanation of a theory or supposition that is provisionally accepted in order to interpret certain events or phenomena which provides guidance for further investigation. This may be proven correct or wrong capable of refutation.
Hypothesis comes from greek word ‘hupothesis’ means “to put under” or “to suppose”. In ancient age is referred to a summary of the plot of a classical drama. Scientific Hypothesis is a trial solution to a problem often called an guess where swift conclusion is drawn on available data as it provides suggested outcome based on the evidence which is held as probable or tentative while accepting the fact that it lacks material for a greater degree of certainty. Working Hypothesis is provisionally accepted as a basis for further research constructed as a statement of expectations a conceptual framework in qualitative research.
Further Reading:
https://en.wikipedia.org/wiki/Hypothesis
http://www.businessdictionary.com/definition/hypothesis.html