A titter is an awkward laugh at something that you shouldn’t be laughing at, like during dinner when Uncle Marvin makes a joke about your mother’s new hairstyle. If you try to hide your laugh, it’s probably a titter.
A laugh that you can’t keep in but also can’t let out, that’s a titter. It usually happens in situations where you shouldn’t be laughing, like listening to your English teacher talk about a date he went on the night before, or when someone tells you a joke in a library. A titter is kinder than a snicker, less noticeable than a giggle, quieter than a chuckle, and way less fun than a chortle. Life’s a joke, laugh it up!