Phoneme: The smallest unit of sound that can distinguish one word from another in a particular language.
Holophrastic Speech: This is when a child uses one word to communicate a whole sentence or idea. For example, saying "juice" could mean "I want juice."
Language Acquisition Device (LAD):A hypothetical module of the human mind posited by Noam Chomsky that is responsible for children's innate predisposition for language acquisition.