"by definition" means, by its very nature (intrinsically). This is referring to the formal meaning of what that particular word is about.

That phrase by itself doesn't make much sense

They are synonyms, both very similar. How ever there is a small difference, people normally use them it different situations. A "hoax" is deception; it is called a hoax when a newspaper knowingly prints a fraudulent story, business scams, bogus political claims, false bomb threats, misleading stunts in public, UFO conspirators and scientific frauds. Basically used for deceitful means, like fraudulently obtaining personal details or money. While a "prank" tends to less serious and more for mischievous means, like a small joke just for laughs. For example, placing a whoopee cushion on someone's seat. Hope this helps

First notebook entry: Introducing myself

My name is Natalie
I am learning Chinese, because I would like to go to China one day and experience the culture first hand with the fluent language.

My native language is English, and I grew up in Australia.

I enjoy martial arts, especially Chinese Kung Fu, I train in Karate and Kung fu.

I love music, I've been learning the piano for 1 year and have composed 10 songs. I also play basketball, do swimming and Karate for 3 years.