the word "transatlantic" is a modern formation, combining the latin prefix "trans-" with the adjective "atlantic." the prefix "trans-" has been used since classical latin to denote movement or position across something. "atlantic" originates from the latin "atlanticus," which referred to the sea beyond the atlas mountains, named for the titan atlas of greek mythology who was condemned to hold up the heavens. the term was solidified in the age of exploration to name the ocean. thus, "transatlantic" literally means "across the atlantic," a meaning that has remained consistent, first describing physical crossings and later expanding to describe political and cultural relations between the continents it separates.

Structure: trans (across) + atlantic (of the atlantic ocean) - trans: from latin, a prefix meaning "across, beyond, through." - atlantic: from latin atlanticus, pertaining to the atlantic ocean, itself derived from the greek mythological figure atlas.