Phoneme
In a language, the smallest distinctive unit sound
Morpheme
In a language, the smallest unit that carries meaning; may be a word or part of a word (such as a prefix)
Grammar
In a language, a system of rules that enables us to communicate with and understand others. In a given language, semantics is the set of rules for deriving meaning from sounds, and syntax is the set of rules for combining words into grammatically sensible sentences.
Babbling
Beginning at about 4 months, the stage of speech development in which the infant spontaneously utters various sounds at first unrelated to the household language
One-Word Stage
The stage in speech development, from about age 1 to 2, during which a child speaks mostly in single words
Two-Word Stage
Beginning about age 2, the stage in speech development during which a child speaks mostly in two-word statements
Telegraphic Speech
Early speech stage in which a child speaks like a telegram – “go car” – using mostly nouns & verbs