The exact definition of a cluster computer will depend a little on who you ask.
The first question will usually concern the exact definition of your claims.
Generally speaking, the exact definition depends on the particular field of study.
Depending on the context different exact definitions of this idea are in use.
It is difficult to give an exact definition for "jazz".
The exact definition for each color may be different at local levels.
There is no universal agreement about the exact definition of this term.
There are also problems in the exact definition of the terms shift and twist.
There is a disagreement as to the exact definition of striking out the side.
I think we'd better start with what is your exact definition of "science".