Also found in: Thesaurus, Medical, Financial, Encyclopedia, Wikipedia.


1. The ordinal number matching the number one billion in a series.
2. One of a billion equal parts.

bil′lionth adj. & adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.billionth - position 1,000,000,000 in a countable series of things
U.S.A., United States, United States of America, US, USA, America, the States, U.S. - North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
rank - relative status; "his salary was determined by his rank and seniority"
2.billionth - one part in a billion equal parts
common fraction, simple fraction - the quotient of two integers
Adj.1.billionth - the ordinal number of one billion in counting order
ordinal - being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh"
واحد من بليون
einn biljónasti; einn òúsund miljónasti
milyarda birtrilyonda bir


adjmilliardste(r, s); (dated Brit) → billionste(r, s)
nMilliardstel nt; (dated Brit) → Billionstel nt


(ˈbiljən) plurals ˈbillion (1 ~3), ˈbillions (2, ~3) – noun
1. often in the United Kingdom, the number 1,000,000,000,000; in the United States, and often in the United Kingdom, the number 1,000,000,000. a billion; several billion.
2. often in the United Kingdom, the figure 1,000,000,000,000; in the United States, and often in the United Kingdom, the figure 1,000,000,000.
3. a billion pounds or dollars. The sum involved amounts to several billion(s).
often in the United Kingdom, 1,000,000,000,000 in number; in the United States and often in the United Kingdom, 1,000,000,000 in number. a few billion stars.
billionaire (ˌbiljəˈneə(r)) noun
a very rich person who has more than a billion dollars, pounds etc. He's not just a millionaire – he's a billionaire!
ˈbillionth noun
one of a billion equal parts.
References in classic literature ?
No," replied Barbicane, "because the terrestrial atmosphere absorbs four-tenths of the solar heat; besides, the quantity of heat intercepted by the earth is but a billionth part of the entire radiation.
THE billionth new PS1 coin has passed through the Royal Mint's production line, as shoppers and retailers prepare to bid farewell to the old "round pound".
While the billionth Groupon sold was a pizza promotion in the St.
He repeated the feat this December 2014 when the same video, seen below, went past the 2 billionth mark.
Just as Professor Peter Higgs postulated the Higgs Boson decades before it was found, so Andrei Linde, of Stanford University, in the early 1980s, produced a theory of "inflation" to explain the near-instantaneous growth of the Universe, from nothing to something enormous, in a billionth of a billionth of a billionth of a millionth of a second.
APPLE'S App Store hit an incredible milestone earlier this week when it registered its 50 billionth app download.
ACTS such as Adele and Maroon 5 have helped push the UK record industry to a new milestone with the one billionth download of a digital single.
Summary: Babies born in public hospitals across Lebanon Monday received certificates from the United Nations declaring them symbolically to be the 7 billionth person in the world.
Also on hand to witness the event was 12-year-old Lorrize Mae Guevarra, who the Philippines declared as its own symbolic six billionth baby in 1999 when the world reached that demographic landmark.
the early hours of October 31 to unveil the world's seven billionth person.
Thus, filling a 4GB Kindle to its storage limit would increase its weight by a billionth of a billionth of a gram.
NNA - Following is the message of UN Secretary General, Ban Ki moon, on World Population Day, July 11: "This year's World Population Day falls during a milestone year, when we anticipate the birth of the earth's seven billionth inhabitant.