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The Reduplications are made by repeating part of the base. The repeated part does not make sense and will never be used alone and is just popular in spoken language. In recent times, they have been used in some texts of poetry and prose, in particular, in stories written in vernacular. This research, with a historical approach, and with an analytical-explanatory method, examines the information obtained from literary and historical sources; and while analyzing the use of reduplication in Persian language and literature, it investigates three hypotheses: first, the effect of the changing of the face and meaning of the ancient Persian vocabulary on the formation of reduplication in Persian language; second, the effect of the Arabic syntax on the formation of reduplication in Persian language; and third, the effect of Arabic vocabulary and synonyms on the formation of reduplication in Persian language and literature
According to the findings of this research, the history of the use of reduplication dates back to the thirteenth century AH. Most of the compositions, from the first to the thirteenth century AH, are seen in poetic and prose works, and the writers of dictionaries have described them as examples of reduplication but in fact they are synonyms connected by conjunctives which due to a change of face and passage of time are mistakenly claimed to be reduplication. Reduplication has been introduced into Persian language since the thirteenth century AH. This was due to the prevalence of Arabic vocabulary in Persian language and also people’s habits of using synonyms in speaking. Along with developments in Persian prose and the tendency of writers to simplification and vernacularism, these compositions were introduced into Persian texts, especially satirical fictional works. 

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The current paper aimed to conduct a corpus analysis of the relationship between Persian onomatopoeic words and their morphological meanings. All onomatopoeic words listed in The Dictionary of Onomatopoeic Words in Farsi (1996) were analyzed. The analysis of the morphological structure of 2570 onomatopoeic words suggests that there is a correlation between echo duplication and the concept of emphasizing. Partial reduplication indicates the continuance of the meaning of words. Total reduplication of words with a final plosive consonant represents the discontinuance of the meaning of onomatopoeic words. Double reduplications that use an interfix carry on the impression of friction. The reduplicated words that have fricative or affricative consonants suggest the idea of slight events. Echo duplication containing the interfix “va” constructs plurality and multitude. Contrary to the findings of previous studies, the intensity accompanies derivation and not reduplication. The data also suggests that Persian onomatopoeic words use phonetic as well as morphological tools to construe the meaning.