noun /kʌmˈpæɹɪsən,kʌmˈpɛɹɪsən/
a) The act of comparing or the state or process of being compared
He made a careful comparison of the available products before buying anything.
b) An evaluation of the similarities and differences of two (or more) things
There really is no comparison between the performance of todays computers and those of a decade ago.
Wikipedia foundation.