I know there have been a number of Bitcoin or cryptocurrency dictionaries created in the past. You might want to refer to them and compare definitions. Anyway, a few things that you might want to note.
3. Blockchain - Blockchains are decentralized. It is a leger where transactions or blocks which have been validated by miners are recorded. These recorded transactions cannot be altered retroactively once recorded except by altering the subsequent blocks of the block chain.
Blockchains aren't necessarily decentralized. There are centralized blockchains, especially those which are owned by private companies.
7. Halving - This occurs usually during a space of four years. It is a period when the amount of Bitcoin available in circulation is halved therefore causing scarcity which leads to increase in price.
Halving occurs every 210,000 blocks. However, it isn't the "amount of Bitcoin available in circulation" that is halved. What is halved is the block reward for mining.
9. Altcoin - Other types of crypto currencies are classified as altcoins.bitcoin is a crypto currency but is not an altcoin
In other words, anything other than Bitcoin is an altcoin. That includes all those Bitcoin forks.
10. Exchange - This is a platform where Bitcoin transactions can be carried out.consider it as a market place for crypto currencies.
Exchanges aren't simply "platform where Bitcoin transactions can be carried out." Exchanges are platforms where cryptocurrencies could be exchanged with one another or with fiat.