пятиле́тие

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1.
fifth anniversary, five-year anniversary
Мы пра́зднуем пятиле́тие на́шей шко́лы.
We are celebrating the fifth anniversary of our school.
Typically of an institution, event or a child's age.
2.
five-year period, five years, quinquennium
За после́днее пятиле́тие го́род си́льно вы́рос.
Over the last five years the city has grown a lot.
3.
(rare) five-year planeconomics
Заво́д вы́полнил план за пе́рвое пятиле́тие.
The factory fulfilled the plan for the first five-year period.
Soviet economic planning period; usually пятилетка in everyday use.

Examples

За последнее пятилетие город сильно изменился.
The city has changed considerably over the past five years.
Фирма отпраздновала своё пятилетие в ресторане.
The company celebrated its fifth anniversary at a restaurant.
К пятилетию школы выпустили красивый альбом.
A beautiful album was published for the school's fifth anniversary.