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the mental activities associated with thinking, knowing, remembering, and communicating
cognition
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a mental grouping of similar objects, events, ideas, or people.
concept
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in a language, the smallest unit that carries meaning; may be a word or part of a word (such as a prefix)
morpheme
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in a language, a system of rules that enable us to communicate with and understand others
grammar
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the set of rules by which we derive meaning from morphemes, words, and sentences in a given language; also, the study of meaning
semantics
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the rules for combining words into grammatically sensible sentences in a given language
syntax
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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.
babbling stage
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the stage in speech development, from about age 1 to 2, during which a child speaks mostly in single words
one-word stage
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