Hi,
My dictionary offers 3 meanings.
1. Money or medium of exchange.
2. The condition of being current: prevalence, eg of words or ideas.
3. The time during which something is current.
No doubt #1 is the most common usage. However, I don't find the other meanings odd or unusual.
eg
In Re D is the most recent in a line of cases to raise problems with the determination of legal fatherhood under s.28(3) of the Human Fertilisation and Embryology Act 1990. The judgments in In Re D are interesting in particular because they demonstrate the growing currency of the idea that a child has a right to ‘genetic truth’. They also further evidence the ‘fragmentation of fatherhood’. This case is best understood as part of a complex and ongoing negotiation of men’s role in the family in the light of shifting family forms.
from the internet, http://www.ingentaconnect.com/content/klu/fest/2005/00000013/00000003/00009008
Best wishes, Clive