“accent: A variety of speech differing phonetically from other varieties: thus, as in ordinary usage, ‘a Southern accent.’ ‘Scottish accent,’ ‘Scottish accents.’ Normally restricted by linguists to cases where the differences are at most in phonology: further differences, e.g. in syntax, are said to be between dialects.”
Excerpted from: Matthews, P.H., ed. The Oxford Concise Dictionary of Linguistics. New York: Oxford University Press, 2014.