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

bil′lionth adj. & adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


(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.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
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."
A Gateshead-based business has accepted its three billionth piece of work in just a year.
The billionth song was 'Speed of Sound' as part of the X&Y album from Coldplay, downloaded by Alex Ostrovsky from West Bloomfield, Michigan, in the US.
(One nanogram is a billionth of a gram.) With every 10-degree rise in temperature, the amount of methane released each hour roughly doubled.
One billionth acre of biotech enhanced products was planted.
Although "nano" means billion--as in a nanometer being one billionth of a meter--here are a couple of more picturesque ways to think about nanoclay, courtesy of Robert Briell, chief scientist for Southern clay Products.
Typical of the alarmists was an article in the Toronto Star which announced the birth of India's billionth citizen.
This is not to say that they break down slowly in any absolute sense-it takes just under a billionth of a second-but if they broke down by way of the strong reaction, it would only take a billionth of a billionth of a second.
Taipei Metro is soon to welcome its 10 billionth passenger, and Taipei Rapid Transit Corporation is launching a series of events and activities in celebration.
M2 EQUITYBITES-June 2, 2015-Freescale reports milestone shipment of billionth copper wire component
The 25 billionth song was Monkey Drums by Chase Buch, and was purchased by Phillip Lupke from Germany, who will soon receive the gift card from Apple.
Little Danica May Camacho, right, born in the Phillipines, was chosen by the United Nations to represent the world's seven billionth person.