It means: "...compared to the value it had a certain number of years ago". So back then you could buy an item for 45 cents that you now would have to pay a dollar for.
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You most likely mean a kennedy half dollar with the date 1776-1976, such coins are common and unless in mint packaging are only worth 50 cents.
No such thing. If you mean a 1968 Washington QUARTER, it's still worth 25 cents. If you mean a '68 KENNEDY half dollar, it's worth around $4 because of its silver content.
Maybe you mean Kennedy? Unless it is a proof coin or very high grade uncirculated, it's worth fifty cents.
That depends on which dollar coin you mean, 4 different series are in circulation today.
There was no US silver dollar minted in 1950. If you mean a half dollar, it would be worth at least its value in silver which as of writing is about $7.70 but it would be worth more in better condition. As with all old coins, cleaning harms the value.