IPA: //bɪˈmɪlənˌɛri//
KK: /bɪˈmɪlənˌɛri/
A period of two thousand years or a celebration marking the 2000th anniversary of an event.
The city held a grand celebration for its bimillenary, marking two thousand years since its founding.
Bimillenary → It is formed from "bi-" (meaning two) and "millennium" (from Latin "mille", meaning thousand, and "annus", meaning year). The word refers to a period of two thousand years.
Think of 'two' ('bi-') thousand years ('millennium') to remember that 'bimillenary' refers to a span of two thousand years.