linguistic:voice_change
Tone and stress

Only the penultimate or final syllable of a root can have a high tone, and if the penultimate is high, the final must also be high; this implies that Oromo has a pitch-accent system (in which the tone need be specified only on one syllable, the others being predictable) rather than a tone system (in which each syllable must have its tone specified), although the rules are complex (each morpheme can contribute its own tone pattern to the word), so that "one can call Oromo a pitch-accent system in terms of the basic lexical representation of pitch, and a tone system in terms of its surface realization." The stressed syllable is perceived as the first syllable of a word with high pitch.