from
The Collaborative International Dictionary of English v.0.48
Transatlantic \Trans`at*lan"tic\ (tr[a^]ns*[a^]t*l[a^]n"t[i^]k),
a. [Pref. trans- + Atlantic: cf. F. transatlantique.]
1. Lying or being beyond the Atlantic Ocean.
[1913 Webster]
Note: When used by a person in Europe or Africa,
transatlantic signifies being in America; when by a
person in America, it denotes being or lying in Europe
or Africa, especially the former.
[1913 Webster]
2. Crossing the Atlantic Ocean; as, a transatlantic flight.
[1913 Webster +PJC]