Pronunciation: /ˈsɛkʃ(ə)n(ə)lɪz(ə)m/
noun
[mass noun]-
restriction of interest to a narrow sphere; undue concern with local interests or petty distinctions at the expense of general well-being: the rise of democracy, capitalism, and sectionalism [with modifier]: this line stressed a national interest rather than anti-gay sectionalism

Derivatives
-
noun & adjective