#redirect In the linguistic functionalism of the Prague School and the work of Jakobson, a [[linguisticsphoneme]]is defined as a phonological unit with a distinctive function that cannot be broken down into smaller units with similar functions. A [[phoneme]] is defined by its distinctive features, such as its being voiced (/v/) or non-voiced (/f/). the list of [[phoeneme]]s making up any given language is a closed list; Castilian employs twenty-four phonemes.