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The phrase "approximately fifty years" is correct and usable in written English.
It can be used when estimating a duration of time that is close to fifty years but not exact.
Example: "The project has been in development for approximately fifty years, evolving with each new technological advancement."
Alternatives: "about fifty years" or "roughly fifty years".
Exact(4)
Leo Tolstoy wrote in the eighteen-sixties about the events of 1812 — approximately fifty years after the fact.
During approximately fifty years before 1948, there were successive waves of Jewish immigration, which brought with them a whole range of foods and cooking styles.
It has been approximately fifty years since Reysenbach de Haan [53] and Fraser and Purves [55] espoused that the evolutionary revamping of the middle ear was a corrective response to the selective pressures resulting from the large decrease in amplitude that occurred because of the transition between aerial and aquatic hearing environments.
Since it was first described approximately fifty years ago [ 3], cellular senescence has emerged as an important mechanism linked to both tumor suppression and aging.
Similar(56)
The difference for women is approximately seven years.
The American newspaper has been around for approximately three hundred years.
By 2000 it had fallen to approximately three years.
The mother raises the young for approximately two years.
ShipitDog I've been a Ukip supporter for approximately two years now.
For approximately four years we have been paying the rent under my wife's name.
The Queens plan would offer exhibition space for a period of approximately two years, from 2002-2004.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com