1. The tone or character of something.
…Zamenhof did not put together Esperanto in order to show that he could invent a language. He was trying to achieve world peace. As usual, he gave his project a rather naïve coloration. In “Unua Libro,” he inserted a page printed with eight identical coupons—one for you and seven, presumably, to distribute to friends—on which you promised that if ten million other people agreed to learn the new language you would, too.