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The phrase "a billion year" is not correct in written English; it should be "a billion years." You can use it when referring to a time span of one billion years, typically in scientific or historical contexts.
Example: "The Earth is estimated to be around 4.5 billion years old, which means it has undergone significant changes over a billion years."
Alternatives: "one billion years" or "a billion years' time."
Exact(4)
Palaeontologists have a slightly different take on the world, even at Christmas Christmass dinner is the ceremonial dissection of an avian dinosaur, and there's no finer joke than a half a billion year old arthropod named after Santa Claus.
The payload will be an original Tesla Roadster, playing Space Oddity, on a billion year elliptic Mars orbit.
The Roadster will also be playing David Bowie's Space Oddity, and is aiming to enter a "billion year elliptic Mars orbit," should the launch go perfectly to plan.
If you join Scientology, you sign a BILLION year contract -- which does underscore their message that you, or some form of you, will be around that long.
Similar(56)
A: Five years, max.
This took about a billion years.
Dictyostelium discoideum came to scientific life in 1935, when it was discovered by Raper in the USA Virginia forest, but belongs to a billion year-old Amoeboza lineage, which diverged from the animal-fungal lineage after the plant animal-split.
They never mentioned a Five year Plan?
There's a five year guarantee.
In over a ten year period.
A two year hiatus followed.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com