Christmas island

What is Christmas island?

Christmas island definition and meaning on Dictionary terms:
an Australian island in the Indian Ocean, about 190 miles (300 km) S of Java. 52 sq. mi. (135 sq. km).
one of the Line Islands, in Kiribati (Gilbert Islands), in the central Pacific; sovereignty disputed by U.S.: largest atoll in the Pacific; former U.S. test center for nuclear warheads. About 220 sq. mi. (575 sq. km).