adj.
1.the ordinal number of one billion in counting order billionth n.
1.position 1,000,000,000 in a countable series of things
2.one part in a billion
Idiom of the Day
make overtures to (someone)
to approach someone in a friendly way in order to talk about something or deal with something, to make a formal proposal or offer
The woman made overtures to her friend to try and solve their recent problems.