south southeast south·sout·heast uncommon noun (1) adverb (1) noun 1. the compass point midway between south and southeast Synonymssouth southeastsou'-sou'-eastSSE adverb 1. to, toward, or in the south-south-east Synonymssou'-sou'-east Related words Broader terms compass point WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.