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confirmation meaning you just now received your bitcoin.
Number of confirmations is the number of blocks that have been generated after the one including your transaction.
Number of confirmations can be seen as how safe the transaction is. The more confirmations there are, the harder for an attacker to tamper that transaction.
Ideally, 1 confirmation = 10 minutes but in reality it depends on the hashing power and the difficulty at the moment of generating the block.