Stress Circumflex

bilingual sign showing use of circumflex in welsh indicator of length , stress: parêd [paˈreːd] parade , opposed pared [ˈparɛd] partition wall .

the circumflex accent marks stressed vowel of word in languages:

portuguese â, ê, , ô stressed “closed” vowels, opposed open counterparts á, é, , ó (see below).
welsh: circumflex, due function disambiguating lengthening sign (see above), used in polysyllabic words word-final long vowels. circumflex indicates stressed syllable (which on penultimate syllable), since in welsh, non-stressed vowels may not long. happens notably singular ends in a, to, e.g. singular camera, drama, opera, sinema → plural camerâu, dramâu, operâu, sinemâu; however, occurs in singular nominal forms, e.g. arwyddocâd; in verbal forms, e.g. deffrônt, cryffânt; etc.