| Library / English Dictionary |
BILLIONTH
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
One part in a billion equal parts
Synonyms:
billionth; one-billionth
Classified under:
Nouns denoting quantities and units of measure
Hypernyms ("billionth" is a kind of...):
common fraction; simple fraction (the quotient of two integers)
Sense 2
Meaning:
Position 1,000,000,000 in a countable series of things
Classified under:
Nouns denoting relations between people or things or ideas
Hypernyms ("billionth" is a kind of...):
rank (relative status)
Domain region:
America; the States; U.S.; U.S.A.; United States; United States of America; US; USA (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)
II. (adjective)
Sense 1
Meaning:
The ordinal number of one billion in counting order
Classified under:
Similar:
ordinal (being or denoting a numerical order in a series)
Context examples:
One ppbv means that if you take a volume of air on Mars, one billionth of the volume of air is methane.
(Curiosity Detects Unusually High Methane Levels, NASA)
A unit of catalytic activity concentration defined as the catalytic activity of the component equal to one billionth of katal (10E-9 katal) in the unit volume of the system equal to one liter.
(Nanokatal per Liter, NCI Thesaurus)
A unit of radioactivity equal to one billionth of a curie or 37 becquerels, and corresponding to radioactivity of 37 atomic disintegrations per second.
(Nanocurie, NCI Thesaurus)
