The word "however" is an adverb and a conjunction with several related meanings:
- It is used to introduce a statement that contrasts or differs from what has just been said, similar to "but" or "nevertheless." For example, "I'd like to go; however, I'd better not."
- It means "to whatever degree or extent," indicating no matter how much or how little something happens. For example, "However hard she tried, she couldn't convince him."
- It means "in whatever way" or "no matter how," used to talk about the manner in which something is done. For example, "Do it however you like."
- It can be used to express surprise in British English, e.g., "However did he get that job?"
In summary, "however" serves to show contrast, degree, or manner depending on context.
