Quite useful link. I have a query of my own which I feel can be discussed under this topic rather than start a new one.
We know that margins refer to the borders on a page. When the students write answers, we teachers insist that they also draw a line after every answers as the writing looks more neat and tidy. My doubt is are those lines drawn after an answer simply referred as lines or as margins? Many people including me referred them as margins but one of my colleagues corrected me saying that the margins on a page refer only to the line drawn around the edges. Would be grateful if anyone can explain me the correct usage of the word margin.