millennium bug
Informal.
a bug that can cause computers or software to misinterpret the first two digits of the year 2000 as 19, due to the coding of dates using only the last two digits of the year.
Also called
Y2K problem,
Y2K bug.
Origin of millennium bug
1990–95
Words nearby millennium bug
millennial,
millennial church,
millennialism,
millennium,
millennium bridge,
millennium bug,
millepede,
millepore,
miller,
miller index,
miller's disease
British Dictionary definitions for millennium bug
millennium bug
noun
computing
any software problem arising from the change in date at the start of the 21st century