south (adv.)

Old English suð "southward, to the south, southern, in the south," from Proto-Germanic *sunthaz, perhaps literally "sun-side" (source also of Old Saxon, Old Frisian suth "southward, in the south," Middle Dutch suut, Dutch zuid, German Süden), and related to base of *sunnon "sun" (from PIE root *sawel- "the sun"). Old French sur, sud (French sud), Spanish sur, sud are loan-words from Germanic, perhaps from Old Norse suðr.

As an adjective from c. 1300; as a noun, "one of the four cardinal points," also "southern region of a country," both late 13c. The Southern states of the U.S. have been collectively called The South since 1779 (in early use this often referred only to Georgia and South Carolina). South country in Britain means the part below the Tweed, in England the part below the Wash, and in Scotland the part below the Forth. South Sea meant "the Mediterranean" (late 14c.) and "the English Channel" (early 15c.) before it came to mean (in plural) "the South Pacific Ocean" (1520s). The nautical coat called a sou'wester (1836) protects the wearer against severe weather, such as a gale out of the southwest.

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Definitions of south from WordNet
south (n.)
the cardinal compass point that is at 180 degrees;
Synonyms: due south / southward / s
south (n.)
a location in the southern part of a country, region, or city;
south (n.)
the direction corresponding to the southward cardinal compass point;
south (adv.)
in a southern direction;
we moved south
Synonyms: to the south / in the south
south (adj.)
situated in or facing or moving toward or coming from the south;
the south entrance
South (n.)
the region of the United States lying to the south of the Mason-Dixon line;
South (n.)
the southern states that seceded from the United States in 1861;
Synonyms: Confederacy / Confederate States / Confederate States of America / Dixie / Dixieland