Use context clues to find out a word's meaning. Context clues are when a person figures out the meaning of a word by seeing how the word was used in a sentence. For example, you were reading the following sentence and wanted to know what 'pessimist' means:My mother is always happy and optimistic, the total opposite of my brother, the pessimist. So from the sentence, you can gather that 'pessimist' means the opposite of happy, so pessimist means being moody and angry. Good, experienced readers always use context clues! If you find a word that you're totally stumped on, use the dictionary! If you want to save time and the hassle of turning pages, go to the online dictionary.