Letter/ˈletər/ Definition 1 of 6Pro Tip 1/3Pronunciation Variants Some letters represent multiple sounds, which vary by word. The letter 'c' sounds like 's' in 'cent' and like 'k' in 'cat'. Pro Tip 2/3Silent Letters Letters are not always spoken; some are silent in certain words. The 'k' in 'knight' is silent. Pro Tip 3/3Alphabet Order The order of letters in the alphabet is fixed and used for organization. In a dictionary, 'apple' comes before 'banana' because of alphabet order.