One of the longest words in the English language is pneumonoultramicroscopicsilicovolcanoconiosis, and it's 45 letters long. The shortest words are "A," "I" and "O." Those are the only one-letter words recognized in English, and "O" is an interjection that is commonly spelled "oh." It may seem like there are infinite words in the English language, but most dictionaries hover around 250,000 to 300,000 entries, and thousands of those words are obsolete. One of the smallest word categories in English is two-letter words. There are a few more than 100 of them, and many are abbreviations or shortened versions of longer words.
With that being said, two-letter words are some of the most popular in English. They are the glue to our sentences and phrases, and it's impossible to speak or write without them. As popular as they are, most people take them for granted. "If," "it," "is," "in," "to" and "do" are two-letter words that we use every day, but do you know what they actually mean? If you consider yourself a wordsmith or just need some new words to use in Scrabble, put your skills to the test here. Take a look at these two-letter words, and match them to their correct definitions.