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This paper presents results of a phonological and phonetic study of stress in Chickasaw, a Muskogean language spoken in south central Oklahoma. Three degrees of stress are differentiated acoustically, with primary stressed vowels having the highest f0 and greatest duration and intensity, unstressed vowels having the lowest f0 and shortest duration and intensity, and secondary stressed vowels displaying intermediate f0, duration, and intensity values. Vowel quality differences and segmental lenition processes also are diagnostic for stress. The location of stress is phonologically predictable, falling on word-final syllables, heavy (CVC and CVV) syllables, and on the second in a sequence of light (CV) syllables. Short vowels in nonfinal open syllables are made heavy through a process of rhythmic vowel lengthening. Primary stress is sensitive to a further weight distinction, which treats CVV as heavier than both CV and CVC. In words lacking a CVV syllable, stress falls on the final syllable. [ABSTRACT FROM AUTHOR]