line of thought noun2 •A way of thinking about a particular topic, concept, or problem, that follows a logical progression of reasoning or argument.Let me approach this line of thought a bit indirectly. — 2009 •Way of thinking."Even today there is a dictatorship of a narrow line of thought" which kills "people's freedom, their freedom of conscience," the Pope expressed in his April 10 daily Mass. — 2014 formslines of thought