COM-

com- This prefix is pronounced stressed BrE AmE kɒm AmE \ kɑːm (1) if the following syllable is unstressed ( ˌ combi ˈ nation) ; (2) in many disyllabic nouns ( ˈ combine; but com ˈ mand); and (3) occasionally, in context, when contrastively stressed ( ˌ departments and ˈ compartments) . Otherwise it is usually weak kəm in Received Pronunciation and General American, though strong in some regional British speech (com ˈ puter) . Before a stem beginning m , one m is lost ( ˈ commerce, com ˈ mit) .