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ive seen 3 ways of using account/publickeys/address. These all mean the same thing, right ?
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No.
Bitcoin doesn't have "accounts".
Some service providers (such as MtGox or Coinbase) may provide you with an account where (like a bank account) you turn over control of your bitcoin to them and call on them to send it when you desire. In this case they may provide you with one of their bitcoin addresses that you can use to send bitcoins to the account you have with them.
A bitcoin public key is not the same thing as a bitcoin address.
A bitcoin address is created from a public key through a process that includes 2 hashing algorithms and a 32-bit checksum.
If you know the public key, you can calculate the bitcoin address, but if all you have is the bitcoin address, then it is impossible to calculate the public key.
The checksum that is built into the bitcoin address prevents you from accidentally sending bitcoins to the wrong person if you make a typo while entering it.
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how about more standardized lingo...
The lingo is rather standardized already. You ust happen to be unfamiliar with the standardized lingo.