The Definition of Currency

So, according to dictionary.com, this is the definition of currency.

cur·ren·cy
noun, plural cur·ren·cies.
1.  something that is used as a medium of exchange; money.
2.  general acceptance; prevalence; vogue.
3.  a time or period during which something is widely accepted and circulated.
4.  the fact or quality of being widely accepted and circulated from person to person.
5.  circulation, as of coin.

Do pennies fit in these definitions?  Let's see.  Definition #1: this describes what the penny is supposed to do.  Too bad there is nothing about its effectiveness in this role. Moving on to Definition #2: Well there is definitely a PREVALENCE of pennies.  There is an OVER-prevalence of these hated coins.  #3: Hopefully the penny will not fall in this category too much longer.  I definitely hope its on its way out. #4: It's widely accepted but I would debate the actual "circulation" definition. I don't think it goes from person to person. More like bank to retailer to person to garbage can.  And finally #5: I've already stated that the penny doesn't really circulate at all.  They all just get sucked into some mysterious invisible black hole from whence there is no escape.  Seriously, 90% of all pennies fall out of circulation immediately.  That's billions and billions of dollars that we willingly throw away each year.