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Two subjects have been studied in this article: 1. The concepts of simile and similarity, 2. Affixes which inform the concepts of simile and similarity. Affixes such as +CA, +CIl, +mAn, +(I)msl, +(I)mtırak, +sI, +sIl, have been shown like as diminution affixes in some Turkish grammar and grammar term's dictionaries. Indeed, these affixes have similarity functions. In this article, these affixes, explained with the researches and examples that have similarity functions.