Isochrony is the postulated rhythmic division of time into equal portions by a language. Three alternative ways in which a language can divide time are postulated syllable-timed, mora-timed, and stress-timed. Real world languages do not fit quite so easily into such precise categories. Given the lack of solid evidence for a clear-cut categorical distinction between the two rhythmical types, it seems reasonable to suggest instead that all languages (and all their accents) display both types of rhythm to a greater or lesser extent.