noun
: a method of research in the social sciences (as sociology or psychology) in which a controlled experimental factor is subjected to special treatment for purposes of comparison with a factor kept constant
noun
: a method of research in the social sciences (as sociology or psychology) in which a controlled experimental factor is subjected to special treatment for purposes of comparison with a factor kept constant
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012