PT Journal AU Stehlik, P SO Romanica Olomucensia PY 2013 BP 151 EP 159 VL 25 IS 2 DI 10.5507/ro.2013.018 DE linguistics; morphology; Spanish; interfixation; parasynthesis. AB This article examines three aspects closely related to the mechanisms of interfixation and parasynthesis in Spanish: 1) the importance of diachronic approach for analyzing parasynthetic and interfixed formations; 2) the semantic value of the affix in question; and 3) the consequences of the interpretation of the final segment as derivative or inflectional morpheme in parasynthetic and interfixed verbs. According to our research, the concepts of interfixation and parasynthesis are both based on a diachronic perspective, which makes difficult the application of purely synchronous methods to analyze words formed by these processes. Another problem in common is that in both procedures, it is difficult to determine the specific semantic value of the affix (interfix or prefix). As for the third above-mentioned aspect, the interpretation of the verbal suffix (especially -ar) as inflectional morpheme necessarily leads to the redefinition of all parasynthetic and interfixed verbs, turning these into suffixed or prefixed words, respectively. ER