Duality of patterning is an important linguistic concept that refers to the idea that human language has two levels of structure - the sounds (phonemes) and the meaning (morphemes and words) - that work in tandem to create an infinite number of words and sentences. Synonyms for duality of patterning include phonology and morphology, as well as the related concepts of phonetics and semantics. Other terms that may be used to describe this phenomenon include linguistic structure, language complexity, and linguistic diversity. Regardless of the terminology used, the duality of patterning is a fundamental aspect of human language that distinguishes it from other forms of communication and allows for the rich and varied expressions of human experience.