Source : Webster's Revised Unabridged Dictionary (1913)

Southerly \South"er*ly\ (?; 277), a.
   Southern.

Source : WordNet®

southerly
     adj 1: situated in or oriented toward the south; "a southern
            exposure"; "took a southerly course" [syn: {southern}]
     2: from the south; used especially of wind; "a hot south wind";
        "southern breezes"; "the winds are southerly" [syn: {southern}]
     n : a wind from the south [syn: {south wind}, {souther}]
     adv 1: toward the south; "the ship turned southerly"
     2: from the south; "a wind blew southerly"