OVERSEAS
abroad, overseas
(adjective) in a foreign country; “markets abroad”; “overseas markets”
oversea, overseas
(adjective) being or passing over or across the sea; “some overseas trade in grain arose”
overseas, abroad
(adverb) in a place across an ocean
oversea, overseas
(adverb) beyond or across the sea; “He lived overseas for many years”
Source: WordNet® 3.1
Etymology
Adjective
overseas (not comparable)
Abroad.
(used with ethnicities, nationalities, or religious affiliations) Living (being resident) in a foreign country.
Across a sea; to or in an area across a sea.
Adverb
overseas (not comparable)
Abroad.
Across a sea; to an area across a sea.
Source: Wiktionary
O"ver*sea", O"ver*seas", adv.
Definition: Over the sea; abroad. Milton. Tennyson.
Source: Webster’s Unabridged Dictionary 1913 Edition