Etymology
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Tet (n.)

Vietnamese lunar new year, 1885, short for Tet Nguyen Dan "feast of the first day." The North Vietnamese Tet Offensive in the U.S. Vietnam War began Jan. 30, 1968.

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Definitions of Tet

Tet (n.)
the New Year in Vietnam; observed for three days after the first full moon after January 20th;
From wordnet.princeton.edu