EN
This paper contributes to the study of structural distinctiveness of the category of ideophony. The author analyses the extent to which Xhosa ideophones exhibit the so-called extra-systematic properties, which cross-linguistically tend to distinguish ideophones from other lexical classes. The analysis demonstrates that ideophones are relatively extra-systematic in Xhosa, although their extra-systematicity is not unitary. It is the largest in morphology, slightly less visible in phonology, and only residual in syntax. It is proposed that the distinct degrees of extra-systematicity are related to differences in grammaticalization and a gradual integration of ideophones into the Xhosa grammar – with the adjustment in syntax occurring faster than the morphological adaptation. In this paper – the first in a series of two articles – the author deals with methodological issues and introduces evidence related to the phonology and morphology of ideophones in Xhosa.