A dictionary is like a book full of words and their meanings. It's like a big list of words that you can use to look up the meaning of a word you don't know. To use a dictionary, you need to find the word you don't know, then look up its meaning in the dictionary. You can do this by using the alphabet at the side of the dictionary to find the first letter of the word, then you can scan through the page to find the word you need. Once you find the word, you can look at the definition of it and then you will know what it means!