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[kwɔ'dreniəl]
общая лексика
четырёхлетний
прилагательное
общая лексика
длящийся четыре года
книжное выражение
происходящий раз в четыре года
существительное
[kwɔ'dreniəl]
общая лексика
событие
происходящее раз в четыре года
четырёхлетний юбилей
устаревшее выражение
четырёхлетний период
[æni'və:s(ə)ri]
прилагательное
общая лексика
ежегодный
годовой
юбилейный
существительное
[æni'və:s(ə)ri]
общая лексика
годовщина
празднование годовщины (какого-л. события)
юбилей
An anniversary is the date on which an event took place or an institution was founded in a previous year, and may also refer to the commemoration or celebration of that event. The word was first used for Catholic feasts to commemorate saints.
Most countries celebrate national anniversaries, typically called national days. These could be the date of independence of the nation or the adoption of a new constitution or form of government. There is no definite method for determining the date of establishment of an institution, and it is generally decided within the institution by convention. The important dates in a sitting monarch's reign may also be commemorated, an event often referred to as a "jubilee".