A prefix is added in front of a word or a root to create a new word. By adding a prefix, you enhance or change its meaning.
Although you cannot tell the meaning of a word from the prefix alone, the prefix can help you get an idea of what the word is about.
In fact, you can look at the prefix of prefix to determine the meaning: pre- means before and the root, fix means fix or attach. So, by combining the meanings, you can figure out that prefix means attach before. And that is exactly what you do with a prefix: You attach it before the root. In other words, a prefix appears at the beginning of a word.
18 of the 100 best Xbox 360 games were released in 2010, according to Metacritic. 19 of of the best 100 PS3 games were released the same year. 2009 was a great year too, with 15 and 18 of the best Xbox and PS3 games, respectively; 2011 had an identically strong showing.
This, you might say, was the golden era of the last console generation, and it started four years after the generation began.
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