Definition of "mechanical system" []

• A system of elements that interact on mechanical principles (noun)

WordNet. Princeton University. 2010.

• "The second line of argument advanced in favour of Parallelism is as follows: The principle of the conservation of energy supposes, we are told, that the universe is a closed mechanical system in which events, whether past or future, are calculable with the utmost precision, given the knowledge of any one stage in the development of that universe and the laws according to which that development takes place."