Source : Webster's Revised Unabridged Dictionary (1913)

Oversea \O"ver*sea"\, a.
   Beyond the sea; foreign.

Oversea \O"ver*sea"\, Overseas \O"ver*seas"\, adv.
   Over the sea; abroad. --Milton. Tennyson.

Source : WordNet®

oversea
     adj : being or passing over or across the sea; "some overseas
           trade in grain arose" [syn: {overseas}]
     adv : beyond or across the sea; "He lived overseas for many years"
           [syn: {overseas}]