why
//waɪ//A1Frequency Level 2
Adverb
whyCanonical form
1
For what reason or purpose; used to ask about the cause or explanation of something.
Why are you late?
2
For which reason; on account of which (used to introduce a relative clause).
That's the reason why I left early.
Noun
1
The reason, cause, or purpose for which something happens or is done.
I want to understand the why behind his decision.
Interjection
1
Used to express surprise, indignation, or impatience.
Why, that's wonderful news!