Basis Price
  
There are actually two ways to describe the value of a debt security, like a bond.
They have a price, just like a stock or any other asset. This describes the amount of cash it would take to buy them. Bonds also come with yields, which describe how much an investor will make on their investment on an annual basis. This second category is also called its basis price. So a bond with a yield of 6% has a basis price of 6% as well.
Okay, just to explain the name a bit:
Interest rates and yields are often described in what is called "basis points." A basis point is one one hundredth of a percent. So a bond with a 6% yield also has a yield of 600 basis points.
Might seem like semantics, but it clarifies changes in prices. If you have a bond yielding 6% and you say that the yield "rose by 1%"...uh, yeah. That's a little ambiguous. It could mean that it increased one percentage point to 7%, or that it increased by 1%, meaning it increased to 6.06%. Talking about the yield in terms of basis points fixes the problem. "The yield increased by 100 basis points" creates no confusion. Unless, like, you're talking to a complete noob.
Anyway, that terminology provides the "basis" part of the "basis price."
Related or Semi-related Video
Finance: What is a Realized Gain or Loss...2 Views
finance a la shmoop what is a realized gain or loss hey whoa whoa yes those are
all the sounds of realization oh and golly gee willikers yes that too well [Man looking surprised]
when you realize a gain or loss it means that you've turned an investment into
cash if your investment has been profitable then you've realized a gain [Cash stacks landing on each other]
and goes the other way too if you've made an unwise investment and are now [Man placing bets on roulette table]
living in a van down by the river well then you probably realized a loss and
you probably also realized the importance of owning real estate that [White van moving into river]
doesn't roll why is it important to understand realized gains and losses
rhymes with shmaxes well the government at least thus far does not tax Americans
on the assets they have rather it taxes them only when they convert those assets
into cash assets like stocks bonds real estate appreciated crayon drawings that
got sold on eBay for a big price if someone pays you cash then its taxable [eBay crayon listing appears]
the idea being that an investment in a vacuum by itself isn't all that useful
like owning shares in a private company that's probably worth a lot more but may
or may not be worth anything later when you go to sell it or even if that
company's public you own a lot of shares in it well until you turn them into cash [Shares transform into cash]
nothing is certain because even public companies can go down a whole lot in
value so the government keeps its sticky paws off of those things things that are
just investments and only comes a-knockin when the investments are
converted into cash and you know that cash can be used to do stuff like buy [Investment assets transform into pile of cash]
cars and pay tuition and rent and get the occasional multicolored water slide
for the front entryway one big double yellow line on the highway is crossed [Car driving along highway]
after one year that is when you've made an investment and held it for at least a
year and then you go to sell it well you generally get a lower tax rate
applied to you then you would have had you held that investment less than a
year why well if you're holding it a year the government wants to reward you [Man holding stocks]
and it makes the markets more stable when you hold the investments
long period of time so they give you a tax break by encouraging people to marry
investments holding them many years instead of just dating them for a few [Man at altar with investment bride]
weeks while one goal the politicos have is to create a more stable predictable
investment climate it makes a lot of sense all right and predictable is good
like a pun at the end of a shmoop video oh we barely got one in there [Man sitting on a bench and bear appears]
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