Words often come to have several meanings through being used to describe things which are connected in some way with the things for which they were originally used. The word _house_ originally had one meaning, which it still keeps, but to which several others have been added. It was a building merely, but came in time to be used to mean the building and the people living in it. Thus we say one person "disturbs the whole house." From this sense it got the meaning of a royal family, and we speak of the House of York, Lancaster, Tudor, or Stuart. We also use the word in a large sense when we speak of the "House of Lords" and the "House of Commons," by which we hardly ever mean the actual buildings known generally as the "Houses of Parliament," but the members of the two Houses. The word _world_ has had almost the opposite history to the word _house_. World originally applied only to persons and not to any place. It meant a "generation of men," and then came to mean men and the earth they live on, and then the earth itself; until it has a quite general sense, as when we speak of "other worlds than ours." Many words which are used at present to describe bad or disagreeable things were used quite differently originally. The word _villain_ is, perhaps, the most expressive we can use to show our opinion of the depths of a person's wickedness. Yet in the Middle Ages a villain, or "villein," was merely a serf or labourer bound to work on the land of a particular lord. The word in Saxon times would have been _churl_. As time went on both these words became terms of contempt. The lords in the Middle Ages were certainly often more wicked than the serfs, as we see in the stories of the days of Robin Hood; but by degrees the people of the higher classes began to use the word _villain_ more and more contemptuously. Many of them imagined that only people of their own class were capable of high thoughts and noble conduct. Gradually "villainy" came to mean all that was low and vulgar, and by degrees it came to have the meaning it has now of "sheer wickedness." At the end of the Middle Ages there were practically no longer any serfs in England; but the word _villain_ has remained in this new sense, and gives us a complete story of the misunderstanding and dislike which must have existed between "noble" and "simple" to cause such a change in the meaning of the word. The word _churl_ has a somewhat similar history. We say now that a sulky, ungracious person is a "mere churl," or behaves in a "churlish" manner, never thinking of the original meaning of the word. Here, again, is a little story of injustice. The present use of the word comes from the supposition that only the mere labourer could behave in a sulky or bad-tempered way.