The Collaborative International Dictionary of English v.0.48:

Sea-gate \Sea"-gate`\, Sea-gait \Sea"-gait`\, n.
   A long, rolling swell of the sea. --Ham. Nav. Encyc.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Seagate, NC -- U.S. Census Designated Place in North Carolina
   Population (2000):    4590
   Housing Units (2000): 2041
   Land area (2000):     3.549730 sq. miles (9.193759 sq. km)
   Water area (2000):    0.566870 sq. miles (1.468186 sq. km)
   Total area (2000):    4.116600 sq. miles (10.661945 sq. km)
   FIPS code:            60060
   Located within:       North Carolina (NC), FIPS 37
   Location:             34.203648 N, 77.843996 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Seagate, NC
    Seagate