coastally,adv.|ˈkəʊstəlɪ| [f. coastal a. + -ly2.] Along the coast, coastwise. 1920Glasgow Herald 20 Mar. 6 Arrange for certain of the ships to proceed coastally to other ports.1953B. Campbell Finding Nests v. 64 Two distinct types: inland on downs or arable land..; coastally in cliff-edge ‘jungles’.