Prefixes change a word’s meaning. Let’s look at different categories of prefixes. Some prefixes change a word to mean its opposite. Others change a word to indicate repetition. Still others refer to quantity or position in time, movement, size or are related to science or medicine in some way. Opposites One of the first prefixes I learned was un. It is probably the simplest way to change a word to its polar opposite. Comfortable becomes uncomfortable, believable becomes unbelievable. In fact, people will understand your meaning even when you use it to create words that don’t exist. I’m thinking of the words undead and uncool. Another common prefix for the…